Add swagger support

ProjectLighthouse/Controllers/Api/UserEndpoints.cs

@@ -0,0 +1,26 @@
+#nullable enable
+using System.Threading.Tasks;
+using LBPUnion.ProjectLighthouse.Types;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace LBPUnion.ProjectLighthouse.Controllers.Api;
+
+public class UserEndpoints : ApiEndpointController
+{
+    private readonly Database database;
+
+    public UserEndpoints(Database database)
+    {
+        this.database = database;
+    }
+
+    [HttpGet("user/{id:int}")]
+    public async Task<IActionResult> GetUser(int id)
+    {
+        User? user = await this.database.Users.FirstOrDefaultAsync(u => u.UserId == id);
+        if (user == null) return this.NotFound();
+
+        return this.Ok(user);
+    }
+}