submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Core/Entity/OneBotStranger.cs

@@ -0,0 +1,29 @@
+using System.Text.Json.Serialization;
+
+namespace Lagrange.OneBot.Core.Entity;
+
+[Serializable]
+public class OneBotStranger
+{
+    [JsonPropertyName("user_id")] public uint UserId { get; set; }
+
+    [JsonPropertyName("avatar")] public string Avatar { get; set; } = string.Empty;
+
+    [JsonPropertyName("q_id")] public string? QId { get; set; }
+
+    [JsonPropertyName("nickname")] public string NickName { get; set; } = string.Empty;
+
+    [JsonPropertyName("sign")] public string Sign { get; set; } = string.Empty;
+
+    [JsonPropertyName("sex")] public string Sex { get; set; } = "unknown";
+
+    [JsonPropertyName("age")] public uint Age { get; set; }
+
+    [JsonPropertyName("level")] public uint Level { get; set; }
+
+    [JsonPropertyName("status")] public OneBotFriendStatus Status { get; set; } = new();
+
+    [JsonPropertyName("RegisterTime")] public DateTime RegisterTime { get; set; }
+
+    [JsonPropertyName("Business")] public List<OneBotBusiness> Business { get; set; } = new();
+}