Add security schemes to docs

docs/components/security.yaml

@@ -0,0 +1,4 @@
+UserAuth:
+  type: apiKey
+  in: cookie
+  name: user

docs/openapi.yaml

@@ -26,3 +26,5 @@ components:
       $ref: "./components/responses/404.yaml"
     "500":
       $ref: "./components/responses/500.yaml"
+  securitySchemes:
+    $ref: "./components/security.yaml"