Add Support section with star CTA and PeekAPI badge

Author: KonstantinKai

README.md

@@ -149,6 +149,18 @@ Bug reports and feature requests: [peekapi-dev/community](https://github.com/pee
 3. Run tests — `bundle exec rake test`
 4. Submit a PR
 
+## Support
+
+If you find PeekAPI useful, give this repo a star — it helps others discover the project.
+
+### Badge
+
+Show that your API is monitored by PeekAPI:
+
+```markdown
+[![Monitored by PeekAPI](https://img.shields.io/badge/monitored%20by-PeekAPI-06b6d4)](https://peekapi.dev)
+```
+
 ## License
 
 MIT