Add spectral rules aliencube#20

related to aliencube#20, aliencube#21
필수 필드를 지정하고, 해당 필드가 없을 경우 에러를 발생시키도록 수정

.spectral.yaml

@@ -0,0 +1,115 @@
+extends:
+  - spectral:oas
+rules:
+  # API 버전 규칙 : v로 시작하고 숫자와 점으로 이루어져야 함
+  api-version-convention:
+    description: API version should follow the convention
+    given: $.info.version
+    severity: error
+    then:
+      function: pattern
+      functionOptions:
+        match: "^v[0-9\\.]+$"
+      message: API version should follow the convention v1, v2.1, v3.0.1, etc.
+
+  # 모든 엔드포인트는 tags를 포함해야 함
+  operation-tags-convention:
+    description: All Operation should include tags
+    given: $.paths[*][*]
+    severity: error
+    then:
+      - field: tags
+        function: truthy
+        message: Tags are required
+
+  # 모든 엔드포인트는 operationId를 포함해야 함 (.WithName 으로 지정)
+  operation-operationid-convention:
+    description: All Operation should include operationId
+    given: $.paths[*][*]
+    severity: error
+    then:
+      - field: operationId
+        function: truthy
+        message: OperationId is required
+
+  # 모든 엔드포인트는 summary와 description을 포함해야 함
+  operation-summary-description-convention:
+    description: All Operation should include summary and description
+    given: $.paths[*][*]
+    severity: error
+    then:
+      - field: 'summary'
+        function: truthy
+        message: Summary is required
+      - field: 'description'
+        function: truthy
+        message: Description is required  
+
+  # Post 요청의 경우 requestbody가 정의되어 있어야함
+  operation-request-convention:
+    description: Post Operation should include request body
+    given: $.paths[*].post
+    severity: error
+    then:
+      - field: requestBody
+        function: truthy
+        message: Request body is required
+
+  # Get 요청의 경우 parameters가 정의되어 있어야함
+  operation-parameters-convention:
+    description: Get Operation might include parameters
+    given: $.paths[*].get
+    severity: warn # 파라미터가 없는 Get 요청에 대응
+    then:
+      - field: parameters
+        function: truthy
+        message: Parameters are required
+
+  # 응답이 정의되어 있어야함
+  operation-response-convention:
+    description: All Operation should include response
+    given: $.paths[*][*]
+    severity: error
+    then:
+      - field: responses
+        function: truthy
+        message: Responses are required
+
+  # 응답 코드 규칙 : 200, 401, 500 응답 코드가 있어야 함
+  operation-responsecode-convention:
+    description: All Operation response should include 200, 401, 500 with description, content
+    given: $.paths[*][*].responses
+    severity: error
+    then:
+      - field: '200'
+        function: truthy
+        message: Response 200 is required
+      - field: '401'
+        function: truthy
+        message: Response 401 is required
+      - field: '500'
+        function: truthy
+        message: Response 500 is required
+
+  # 각 응답 코드는 descriptioin과 content를 포함해야함
+  operation-responsedetail-convention:
+    description: All Operation response should include description, content
+    given: $.paths[*][*].responses[*]
+    severity: error
+    then:
+      - field: 'description'
+        function: truthy
+        message: Description is required
+      - field: 'content'
+        function: truthy
+        message: Content is required
+
+  # 각 응답 코드는 descriptioin과 content를 포함해야하는데, 401은 content가 없어도 됨
+  operation-responsedetail-convention:
+    description: All Operation response should include description, content
+    given: $.paths[*][*].responses[*]
+    severity: off
+    then:
+      - field: 'content'
+        function: truthy
+        message: Content is not required when response code is 401