Move projects to src; add Neutrino secret

src/API/Contracts/Neutrino/Responses/NeutrinoAuthenticateResponse.cs

@@ -0,0 +1,28 @@
+using System.Text.Json.Serialization;
+using API.Contracts.Neutrino.Enums;
+
+namespace API.Contracts.Neutrino.Responses;
+
+// {"ResultCode":1,"UserId":"their user id","Nickname":"splotybean"}
+public class NeutrinoAuthenticateResponse : NeutrinoResultCodeResponse
+{
+    public static NeutrinoAuthenticateResponse Success(string userId, string nickname) => new()
+    {
+        ResultCode = (byte)AuthenticationResultCode.AuthenticationSuccessful,
+        UserId = userId,
+        Nickname = nickname
+    };
+
+    public static NeutrinoAuthenticateResponse Failure(AuthenticationResultCode error) => new()
+    {
+        ResultCode = (byte)error
+    };
+
+    [JsonPropertyName(name: "UserId")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? UserId { get; set; }
+
+    [JsonPropertyName(name: "Nickname")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public string? Nickname { get; set; }
+}