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/custom.yaml

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+name: "Test Authorization"
+base_url: http://localhost:8080
+variables:
+  email: test@example.com
+  password: Test123!
+
+steps:
+  - name: "Register User"
+    request:
+      method: POST
+      url: /api/register
+      headers:
+        Content-Type: application/json
+      body:
+        email: "{{email}}"
+        password: "{{password}}"
+    extract:
+      - name: user_id
+        json_path: "$.id"
+    assert:
+      - type: status
+        value: 201
+
+  - name: "Login"
+    request:
+      method: POST
+      url: /api/login
+      headers:
+        Content-Type: application/json
+      body:
+        email: "{{email}}"
+        password: "{{password}}"
+    extract:
+      - name: token
+        json_path: "$.token"
+    assert:
+      - type: status
+        value: 200
+
+  - name: "Get Profile"
+    request:
+      method: GET
+      url: /api/profile
+      headers:
+        Authorization: "Bearer {{token}}"
+    assert:
+      - type: status
+        value: 200

examples/openapi.yaml

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+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

examples/postman.yaml

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+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); });"