Add a release file

RELEASE.md

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+Release type: minor
+
+This release adds a new `on_ws_connect` method to all HTTP view integrations.
+The method is called when a `graphql-transport-ws` or `graphql-ws` connection is
+established and can be used to customize the connection acknowledgment behavior.
+
+This is particularly useful for authentication, authorization, and sending a
+custom acknowledgment payload to clients when a connection is accepted. For
+example:
+
+```python
+class MyGraphQLView(GraphQLView):
+    async def on_ws_connect(self, context: Dict[str, object]):
+        connection_params = context["connection_params"]
+
+        if not isinstance(connection_params, dict):
+            # Reject without a custom graphql-ws error payload
+            raise ConnectionRejectionError()
+
+        if connection_params.get("password") != "secret:
+            # Reject with a custom graphql-ws error payload
+            raise ConnectionRejectionError({"reason": "Invalid password"})
+
+        if username := connection_params.get("username"):
+            # Accept with a custom acknowledgement payload
+            return {"message": f"Hello, {username}!"}
+
+        # Accept without a acknowledgement payload
+        return await super().on_ws_connect(context)
+```
+
+Take a look at our documentation to learn more.