Add GitHub-related files

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,32 @@
+---
+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. GNU/Linux, Windows, macOS]
+ - Frontend: [e.g. Qt, native Win, native Mac]
+ - Version: [e.g. 1.7.0]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+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.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,8 @@
+Closes #[issue number]
+
+## Description
+
+-
+
+### Screenshots
+

CONTRIBUTING.md

@@ -0,0 +1,9 @@
+### Contributing
+
+**We welcome feedback, bug reports, and pull requests!**  
+
+For pull requests, please stick to the following guidelines:
+* Be sure to test your code changes.
+* Follow the existing code style (e.g., indents).
+* Put a lot of comments into the code, if necessary.
+* Separate unrelated changes into multiple pull requests.