Add templates for issues and PRs

Signed-off-by: Jonas Zohren <15788906+jfowl@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+<!-- If you're requesting an improvement for an existing feature, then please consider filling out an "enhancement request" instead! -->
+<!-- If you're requesting a new feature, that isn't part of this project yet, then please consider filling out a "feature request" instead! -->
+
+**Description**
+<!-- A clear and concise description of what the bug is. -->
+
+**To Reproduce**
+<!-- Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error -->
+
+**Expected behavior**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Logs**
+<!-- If applicable, add an excerpt from the server logs where the error is reported. Remember to censor sensitive values. -->
+
+**Config**
+<!-- If applicable, copy and paste your config (or ideally only relevant parts of it) here. Remember to censor sensitive values. -->
+
+**Your Setup (please complete the following information):**
+ - Host OS: [e.g. Ubuntu 20.04]
+ - NodeJS version [run `node --version`]
+ - HedgeDoc version (Click "Version info" in the footer)
+     - server [e.g. 2.0]
+     - client [e.g. 2.0]
+
+**Additional context**
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/enhancement_request.md

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+---
+name: Enhancement request
+about: Suggest an enhancement of an existing feature.
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+<!-- If you're requesting a new feature, that isn't part of this project yet, then please consider filling out a "feature request" instead! -->
+<!-- If you want to report a bug or an error, then please consider filling out a "bug report" instead! -->
+
+**Which part of the project should be enhanced?**
+<!-- A clean and concise description of which part should be modified. -->
+
+**Is your enhancement request related to a problem? Please describe.**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen and why.
+-->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered.
+-->
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here.
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature for this project, which isn't existing yet.
+title: ''
+labels: 'feature'
+assignees: ''
+
+---
+
+<!-- If you're requesting an improvement for an existing feature, then please consider filling out an "enhancement request" instead! -->
+<!-- If you want to report a bug or an error, then please consider filling out a "bug report" instead! -->
+
+
+**Is your feature request related to a problem? Please describe.**
+<!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
+
+**Describe the solution you'd like**
+<!-- A clear and concise description of what you want to happen.
+-->
+
+**Describe alternatives you've considered**
+<!-- A clear and concise description of any alternative solutions or features you've considered.
+-->
+
+**Additional context**
+<!-- Add any other context or screenshots about the feature request here.
+-->

.github/ISSUE_TEMPLATE/question---other.md

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+---
+name: Question / Other
+about: Questions about the project, features, or organziational issues
+title: ''
+labels: question
+assignees: ''
+
+---
+
+<!-- If you're requesting an improvement for an existing feature, then please consider filling out an "enhancement request" instead! -->
+<!-- If you're requesting a new feature, that isn't part of this project yet, then please consider filling out a "feature request" instead! -->
+<!-- If you want to report a bug or an error, then please consider filling out a "bug report" instead! -->
+
+**What is your question?**
+
+<!-- Please be precise and make it possible to understand your question. -->

.github/pull_request_template.md

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+### Component/Part
+<!-- e.g database -->
+
+### Description
+This PR fixes/adds/improves/...
+
+### Steps
+
+<!-- please tick steps this PR performs (if something is not necessary, please tick anyway to indicate you considered it) -->
+
+- [ ] added implementation
+- [ ] added / updated tests
+- [ ] added / updated documentation
+- [ ] extended changelog
+
+### Related Issue(s)
+<!-- e.g #123 -->