Add backend/apps/api/rest/v0/README.md

Author: arkid15r

backend/apps/api/rest/v0/README.md

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+
+# OWASP API v0
+
+## Important points
+
+When working on this API, **always follow these rules** to avoid breaking clients:
+
+- The authentication class in `__init__.py` **must be named `ApiKey`**.
+  - The client’s `api_key` parameter is automatically derived from this name.
+  - **Do not rename this class**, only update its implementation if needed.
+
+- Each API endpoint must have a **unique `operationId`** in the OpenAPI specification.
+  - Duplicate `operationId`s will break client SDK generation and cause method conflicts.
+
+- Endpoint naming documentation:
+  - [Customize methods](https://www.speakeasy.com/docs/customize/methods)
+  - [Customize namespaces](https://www.speakeasy.com/docs/customize/structure/namespaces)