Add PR and Issue templates (#730)

* added issue and PR templete

* Add more information

* Update feature_request.md

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+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.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. macOS 11.4]
+ - Neovide Version [e.g. 0.5.0]
+ - Neovim Version [e.g. 0.5.0]
+
+**Please run `neovide --log` and paste the results here:**
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+**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/PULL_REQUEST_TEMPLATE.yml

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+# Pull Requests
+
+Please note that we accept pull requests from anyone, but that does not mean it will be merged.
+
+## What kind of change does this PR introduce?
+* Fix
+* Feature
+* Codestyle
+* Refactor
+* Other
+
+## Did this PR introduce a breaking change?
+_A breaking change includes anything that breaks backwards compatibility either at compile or run time._
+* Yes, please list breaking changes
+* No