Initial commit: add RainOpsMini project and documentation

Models/UserIntegral.cs

@@ -0,0 +1,16 @@
+using System;
+using SqlSugar;
+
+namespace RainOpsMini.Models
+{
+    [SugarTable("UserIntegrals")]
+    public class UserIntegral
+    {
+        [SugarColumn(IsPrimaryKey = true)]
+        public string SteamId { get; set; } = null!;
+
+        public int Points { get; set; } = 0;
+
+        public DateTime LastUpdated { get; set; } = DateTime.UtcNow;
+    }
+}