Implement SQL for users, implement retrieving user from database

ProjectLighthouse/Database.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
 using ProjectLighthouse.Types;
 
@@ -8,5 +9,13 @@ namespace ProjectLighthouse {
             ServerSettings.DbConnectionString,
             MySqlServerVersion.LatestSupportedServerVersion
         );
+
+        public async Task CreateUser(string username) {
+            await this.Database.ExecuteSqlRawAsync(
+                "INSERT INTO Users (Username, Biography) VALUES ({0}, {1})",
+                username, "");
+        }
+        
+        public DbSet<User> Users { get; set; }
     }
 }