adding master api project

Application/API/Master/IMasterApi.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using RestEase;
+
+namespace IW4MAdmin.Application.API.Master
+{
+    public class AuthenticationId
+    { 
+        [JsonProperty("id")]
+        public string Id { get; set; }
+    }
+
+    public class TokenId
+    {
+        [JsonProperty("access_token")]
+        public string AccessToken { get; set; }
+    }
+
+    [Header("User-Agent", "IW4MAdmin-RestEase")]
+    public interface IMasterApi
+    {
+        [Header("Authorization")]
+        string AuthorizationToken { get; set; }
+
+        [Post("authenticate")]
+        Task<TokenId> Authenticate([Body] AuthenticationId Id);
+
+        [Post("instance/")]
+        Task<ApiInstance> AddInstance([Body] ApiInstance instance);
+
+        [Put("instance/{id}")]
+        Task<ApiInstance> UpdateInstance([Path] string id, [Body] ApiInstance instance);
+    }
+}