Add more undocumented statuses (#110)

Author: jadentom

src/GitLabApiClient/Models/Pipelines/PipelineStatus.cs

@@ -21,5 +21,7 @@ public enum PipelineStatus
         Preparing,
         [EnumMember(Value = "scheduled")]
         Scheduled,
+        [EnumMember(Value = "created")]
+        Created,
     }
 }