chore: added GitHub issue templates (react-bootstrap#3735)

* feat: added GitHub issue templates

* Update bug_report.md

* Update .github/ISSUE_TEMPLATE/bug_report.md

Co-Authored-By: mxschmitt <[email protected]>

* fix: cleaned up markdown syntax by using markdownlint

Author: mxschmitt

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,43 @@
+---
+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
+
+## Reproducable Example
+
+Minimal example by using [CodeSandbox](https://codesandbox.io).
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Screenshots
+
+If applicable, add screenshots to help explain your problem.
+
+## Environment (please complete the following information)
+
+- Operating System: [e.g. macOS]
+- Browser, Version [e.g. Chrome 74]
+- React-Bootstrap Version [e.g. 1.0.0-beta.8]
+
+## Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,24 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 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.