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/postman.yaml

@@ -0,0 +1,52 @@
+info:
+  name: "Test Collection"
+  schema: "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+
+variable:
+  - key: base_url
+    value: http://localhost:8080
+  - key: email
+    value: test@example.com
+
+item:
+  - name: "Login"
+    request:
+      method: POST
+      url:
+        raw: "{{base_url}}/api/login"
+        host:
+          - "{{base_url}}"
+        path:
+          - api
+          - login
+      header:
+        - key: Content-Type
+          value: application/json
+      body:
+        mode: raw
+        raw: '{"email": "{{email}}", "password": "Test123!"}'
+    event:
+      - listen: test
+        script:
+          exec:
+            - "pm.test('status is 200', function() { pm.response.to.have.status(200); });"
+            - "pm.environment.set('token', pm.response.json().token);"
+
+  - name: "Get Profile"
+    request:
+      method: GET
+      url:
+        raw: "{{base_url}}/api/profile"
+        host:
+          - "{{base_url}}"
+        path:
+          - api
+          - profile
+      header:
+        - key: Authorization
+          value: "Bearer {{token}}"
+    event:
+      - listen: test
+        script:
+          exec:
+            - "pm.test('status is 200', function() { pm.response.to.have.status(200); });"