Add LICENSE and README.md

LICENSE

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+Copyright (c) 2011 Sam Stephenson
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Simple Ruby Version Management: rbenv
+
+rbenv lets you easily switch between multiple versions of Ruby. It's simple, unobtrusive, understandable, and follows in the Unix tradition of single-purpose tools that do one thing well. 
+
+### rbenv _does_…
+
+* Let you **change the default Ruby version** on a per-user basis.
+* Provide support for **per-project Ruby versions**.
+* Allow you to **override the Ruby version** with an environment variable.
+
+### rbenv _does not_…
+
+* **Need to be loaded into your shell.** Instead, rbenv's shim approach works by adding a directory to your `$PATH`.
+* **Override shell commands like `cd`.** That's just obnoxious!
+* **Have a configuration file.** There's nothing to configure except which version of Ruby you want to use.
+* **Install Ruby.** You can build and install Ruby yourself, or use [ruby-build](https://github.com/sstephenson/ruby-build.git) to automate the process.
+* **Manage gemsets.** [Bundler](http://gembundler.com/) is a better way to manage application dependencies. If you have projects that are not yet using Bundler you can install the [rbenv-gemset](https://github.com/jamis/rbenv-gemset) plugin.
+* **Require changes to Ruby libraries for compatibility.** The simplicity of rbenv means as long as it's in your `$PATH`, [nothing](https://rvm.beginrescueend.com/integration/bundler/) [else](https://rvm.beginrescueend.com/integration/capistrano/) needs to know about it.
+* **Prompt you with warnings when you switch to a project.** Instead of executing arbitrary code, rbenv reads just the version name from each project. There's nothing to "trust."
+
+## How It Works
+
+rbenv operates on the per-user directory `~/.rbenv`. Version names in rbenv correspond to subdirectories of `~/.rbenv/versions`. For example, you might have `~/.rbenv/versions/1.8.7-p354` and `~/.rbenv/versions/1.9.3-preview1`. 
+
+Each version is a working tree with its own binaries, like `~/.rbenv/versions/1.8.7-p354/bin/ruby` and `~/.rbenv/versions/1.9.3-preview1/irb`. rbenv makes _shim binaries_ for every such binary across all installed versions of Ruby.
+
+These shims are simple wrapper scripts that live in `~/.rbenv/shims` and detect which Ruby version you want to use. They insert the directory for the selected version at the beginning of your `$PATH` and then execute the corresponding binary. 
+
+Because of the simplicity of the shim approach, all you need to use rbenv is `~/.rbenv/shims` in your `$PATH`.
+
+## Installation
+
+rbenv is a young project, so for now you must install it from source.
+
+1. Check out rbenv into `~/.rbenv`.
+
+        $ cd
+        $ git clone git://github.com/sstephenson/rbenv.git .rbenv
+
+2. Add `~/.rbenv/bin` to your `$PATH` for access to the `rbenv` command-line utility.
+
+        $ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> .bash_profile
+
+3. Add rbenv's shims directory to your `$PATH` and set up Bash autocompletion. (If you prefer not to load rbenv in your shell, you can manually add `$HOME/.rbenv/shims` to your path in step 2.)
+
+        $ echo 'eval "$(rbenv init -)"' >> .bash_profile
+
+4. Restart your shell. You can now begin using rbenv.
+
+        $ exec $SHELL
+
+5. Install Ruby versions into `~/.rbenv/versions`. For example, to install Ruby 1.9.2-p290, download and unpack the source, then run:
+
+        $ ./configure --prefix=~/.rbenv/versions/1.9.2-p290
+        $ make
+        $ make install
+
+    The [ruby-build](https://github.com/sstephenson/ruby-build) project simplifies this process to a single command:
+
+        $ ruby-build 1.9.2-p290 ~/.rbenv/versions/1.9.2-p290
+
+6. Rebuild the shim binaries. You should do this any time you install a new Ruby binary (for example, when installing a new Ruby version, or when installing a gem that provides a binary).
+
+        $ rbenv rehash
+
+## Usage
+
+Like `git`, the `rbenv` command delegates to subcommands based on its first argument. The most common subcommands are:
+
+* **set-default** — sets the default version of Ruby to be used in all shells by writing the version name to the `~/.rbenv/default` file. This version can be overridden by a per-project `.rbenv-version` file, or by setting the `RBENV_VERSION` environment variable.
+
+        $ rbenv set-default 1.9.2-p290
+
+    The special version name `system` tells rbenv to use the system Ruby (detected by searching your `$PATH`).
+
+* **set-local** — sets a local per-project Ruby version by writing the version name to an `.rbenv-version` file in the current directory. This version overrides the default, and can be overridden itself by setting the `RBENV_VERSION` environment variable.
+
+        $ rbenv set-local rbx-1.2.4
+
+* **versions** — lists all Ruby versions known to rbenv, and shows an asterisk next to the currently active version.
+
+        $ rbenv versions
+          1.8.7-p352
+          1.9.2-p290
+        * 1.9.3-preview1 (set by /Users/sam/.rbenv/default)
+          jruby-1.6.3
+          rbx-1.2.4
+          ree-1.8.7-2011.03
+
+* **version** — displays the currently active Ruby version, along with information on how it was set.
+
+        $ rbenv version
+        1.8.7-p352 (set by /Volumes/37signals/basecamp/.rbenv-version)
+
+## Contributing
+
+The rbenv source code is [hosted on GitHub](https://github.com/sstephenson/rbenv). It's clean, modular, and easy to understand, even if you're not a shell hacker.
+
+Please feel free to submit pull requests and file bugs on the [issue tracker](https://github.com/sstephenson/rbenv/issues).
+
+## License
+
+(The MIT license)
+
+Copyright (c) 2011 Sam Stephenson
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.