chore: add patch method in C# (#679)

Author: tiwarishubham635

src/main/java/com/twilio/oai/api/CsharpApiResourceBuilder.java

@@ -135,6 +135,9 @@ public void updateHttpMethod(CodegenOperation co) {
             case "PUT":
                 co.vendorExtensions.put(HTTP_METHOD, CsharpHttpMethod.PUT.getValue());
                 break;
+            case "PATCH":
+                co.vendorExtensions.put(HTTP_METHOD, CsharpHttpMethod.PATCH.getValue());
+                break;
             case "DELETE":
                 co.vendorExtensions.put(HTTP_METHOD, CsharpHttpMethod.DELETE.getValue());
                 break;

src/main/java/com/twilio/oai/common/EnumConstants.java

@@ -128,6 +128,7 @@ public enum CsharpHttpMethod {
         GET("HttpMethod.Get"),
         POST("HttpMethod.Post"),
         PUT("HttpMethod.Put"),
+        PATCH("HttpMethod.Patch"),
         DELETE("HttpMethod.Delete");
 
         private final String value;