Docs.

CONTRIBUTING.md

@@ -2,3 +2,14 @@
 
 Please fork the project into your repository. Before your pull request, ensure you have tested all possible impacts on
 other parts of the project. If no certainty is assured, please contact our core team members for official support.
+
+## Releases
+
+Any new release of formal versions must come after at least 2 alpha versions and 2 beta versions. Each beta version must
+be deployed and tested on a new testing environment following the
+[User Manual](https://leads-docs.projectneura.org/en/latest/vec/user-manual.html).
+
+## Change to APIs
+
+Any effect on the signatures of APIs must go through a deprecation process where the original interfaces must be
+marked deprecated and remain for 3 formal versions.