add(接口)：添加授权、用户、好友关系服务接口

backend/IM_API/Interface/Services/IFriendSerivce.cs

@@ -0,0 +1,32 @@
+using IM_API.Dtos;
+using IM_API.Models;
+
+namespace IM_API.Interface.Services
+{
+    public interface IFriendSerivce
+    {
+        /// <summary>
+        /// 获取好友列表
+        /// </summary>
+        /// <param name="userId">指定用户</param>
+        /// <param name="page">当前页</param>
+        /// <param name="limit">分页大小</param>
+        /// <returns></returns>
+        Task<List<UserInfoDto>> GetFriendListAsync(int userId,int page,int limit);
+        /// <summary>
+        /// 新增好友请求
+        /// </summary>
+        /// <param name="friendRequest"></param>
+        /// <returns></returns>
+        Task<bool> SendFriendRequestAsync(FriendRequestDto friendRequest);
+        /// <summary>
+        /// 获取好友请求
+        /// </summary>
+        /// <param name="userId"></param>
+        /// <param name="isReceived">是否为接受请求方</param>
+        /// <param name="page"></param>
+        /// <param name="limit"></param>
+        /// <returns></returns>
+        Task<Friendrequest> GetFriendRequestListAsync(int userId,bool isReceived,int page,int limit);
+    }
+}