docs: add readme

.gitignore

@@ -14,6 +14,7 @@
 
 !LICENSE
 !Makefile
+!README.md
 !swagger.json
 
 # ...even if they are in subdirectories

README.md

@@ -0,0 +1,15 @@
+# The Licensing API (v1.0)
+
+This repository contains the API definitions for the licensing project. This project should be consumed by other 
+language-specific client libraries. See the list of implementations below.
+
+## Implementations
+
+- [api-go](https://code.pitz.tech/licensing/api-go)
+
+## License
+
+```text
+Copyright (C) 2023 The Licensing Authors
+SPDX-License-Identifier: MIT
+```