docs(README.md): Add versioning policy

Author: KarolJagodzinski

README.md

@@ -114,6 +114,11 @@ uvicorn example:app
 
 For more guides and examples, please see the [documentation](https://ariadnegraphql.org).
 
+## Versioning policy ##
+`ariadne` follows a custom versioning scheme where the minor version increases for breaking changes, while the patch version increments for bug fixes, enhancements, and other non-breaking updates.
+
+Since `ariadne` has not yet reached a stable API, this approach is in place until version 1.0.0. Once the API stabilizes, the project will adopt [Semantic Versioning](https://semver.org/).
+
 
 ## Contributing