Establish the Go module baseline

README.md

@@ -1,9 +1,17 @@
 # ReleaseKit
 
-ReleaseKit is being designed as an opinionated Go library and executable for a
-shared release process. The repository currently contains policies, architectural
-decisions, and implementation proposals. Go packages, commands, and release
-automation have not been implemented.
+ReleaseKit is an opinionated Go library and executable for a shared release
+process. The Go module and documented root `releasekit` facade are established;
+the library operations, runtime version package, executable, tests, and release
+automation remain to be implemented. Their selected behavior and sequence are
+described in the [product roadmap](docs/roadmap/releasekit.md) and
+[implementation plan](docs/roadmap/implementation.md).
+
+Run the offline Go test suite from the repository root with:
+
+```sh
+go test ./...
+```
 
 ## Documentation