chore: add GitHub repository metadata

- Add bug report and feature request issue templates
- Add pull request template
- Add Docker build CI workflow
- Add CONTRIBUTING.md with development guidelines
- Setup .github directory structure

Enhances repository organization and contributor experience.

Author: jenicek001

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,49 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: '[BUG] '
+labels: bug
+assignees: ''
+---
+
+## Bug Description
+A clear and concise description of what the bug is.
+
+## Environment
+- **Hardware**: Raspberry Pi model (e.g., Pi 5, Pi 4)
+- **OS**: Output of `uname -a`
+- **Docker version**: Output of `docker --version`
+- **Thread Radio**: SkyConnect / Other (specify)
+- **Matter Devices**: IKEA Alpstuga / Other (specify)
+
+## Steps to Reproduce
+1. 
+2. 
+3. 
+
+## Expected Behavior
+What you expected to happen.
+
+## Actual Behavior
+What actually happened.
+
+## Logs
+```
+# Docker logs
+docker compose logs matter-mqtt-bridge
+
+# OTBR status
+docker exec otbr ot-ctl state
+
+# IPv6 configuration
+sysctl net.ipv6.conf.all.forwarding
+```
+
+## MQTT Topics
+```
+# Output from mosquitto_sub if relevant
+mosquitto_sub -t 'matter/#' -v
+```
+
+## Additional Context
+Add any other context about the problem here (screenshots, configuration files, etc.).

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,25 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+## Feature Description
+A clear and concise description of the feature you'd like to see.
+
+## Use Case
+Explain the problem this feature would solve or the workflow it would improve.
+
+## Proposed Solution
+Describe how you envision this feature working.
+
+## Alternatives Considered
+Have you considered any alternative solutions or features?
+
+## Additional Context
+Add any other context, mockups, or examples about the feature request here.
+
+## Implementation Ideas
+If you have thoughts on how this could be implemented, share them here.

.github/pull_request_template.md

@@ -0,0 +1,36 @@
+## Description
+Brief description of the changes in this PR.
+
+## Type of Change
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Configuration change
+
+## Changes Made
+- 
+- 
+- 
+
+## Testing
+Describe the tests you ran to verify your changes:
+- [ ] Tested on Raspberry Pi (specify model)
+- [ ] Verified OTBR status
+- [ ] Tested device commissioning
+- [ ] Verified MQTT topics
+- [ ] Checked Docker container health
+
+## Checklist
+- [ ] My code follows the style of this project
+- [ ] I have updated the documentation where needed
+- [ ] I have tested my changes
+- [ ] All Docker services start successfully
+- [ ] MQTT topics work as expected
+- [ ] IPv6 configuration is maintained
+
+## Screenshots (if applicable)
+Add screenshots to demonstrate the changes.
+
+## Related Issues
+Closes #(issue number)

.github/workflows/docker-build.yml

@@ -0,0 +1,41 @@
+name: Docker Build Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+      
+    - name: Build Matter-MQTT Bridge
+      uses: docker/build-push-action@v5
+      with:
+        context: ./bridge
+        file: ./bridge/Dockerfile.bridge-v2
+        push: false
+        tags: matter-mqtt-bridge:test
+        cache-from: type=gha
+        cache-to: type=gha,mode=max
+        
+    - name: Test Docker Compose syntax
+      run: |
+        docker compose -f docker-compose.yml config
+        
+    - name: Verify required files
+      run: |
+        test -f setup.sh
+        test -f README.md
+        test -f bridge/matter_mqtt_bridge_v2.py
+        test -f config/60-otbr-ipv6.conf
+        test -f scripts/setup-ipv6.sh
+        echo "✅ All required files present"