docs: Add example YAML files

- examples/custom.yaml: Custom YAML format example
- examples/postman.yaml: Postman Collection v2.1 example
- examples/openapi.yaml: OpenAPI 3.0 example

examples/openapi.yaml

@@ -0,0 +1,50 @@
+openapi: "3.0.0"
+info:
+  title: "Test API"
+  version: "1.0.0"
+
+servers:
+  - url: http://localhost:8080
+
+paths:
+  /api/login:
+    post:
+      operationId: "loginUser"
+      summary: "Login user"
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                email:
+                  type: string
+                password:
+                  type: string
+      responses:
+        "200":
+          description: "Success"
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  token:
+                    type: string
+
+  /api/profile:
+    get:
+      operationId: "getProfile"
+      summary: "Get user profile"
+      responses:
+        "200":
+          description: "Success"
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  id:
+                    type: integer
+                  email:
+                    type: string