Refactor project structure: modularized code into pkg and cmd directories, added unit tests, improved CI/CD pipeline, and enhanced documentation.

README.md

@@ -55,6 +55,12 @@ Expected JSON payload (simplified):
 
 Note: data is only kept in-memory and will be reset on restart.
 
+## Project Structure
+
+- `cmd/diunwebhook/` — main application source and tests
+- `static/` — static assets
+- `Dockerfile`, `docker-compose.yml`, `go.mod`, `go.sum` — project config/build files
+
 ## Development
 - Code: `main.go`
 - Static assets: `static/`
@@ -65,5 +71,19 @@ Note: data is only kept in-memory and will be reset on restart.
 - Persistence is not implemented; hook up a store (e.g., BoltDB/Redis/Postgres) if you need durability.
 - Consider adding auth, rate limiting, or a secret/token on the webhook endpoint if exposed publicly.
 
+## Testing
+
+Run unit tests and check coverage:
+
+```bash
+go test -v -cover
+```
+
+Aim for 80–90% coverage. Coverage below 80% will emit a warning in CI but will not fail the pipeline.
+
+## CI/CD with Gitea Actions
+
+A sample Gitea Actions workflow is provided in `.gitea/workflows/ci.yml` to automate build, test, and coverage checks.
+
 ## License
 MIT — see `LICENSE`.