Adding users endpoint to return all users to authorized users

Services/UserService.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using GameAuthApi.Models;
 using Microsoft.Extensions.Configuration;
@@ -19,6 +20,9 @@ public class UserService
     public async Task<User> GetByUsernameAsync(string username) =>
         await _users.Find(u => u.Username == username).FirstOrDefaultAsync();
 
+    public async Task<List<User>> GetAllAsync() =>
+        await _users.Find(_ => true).ToListAsync();
+
     public async Task CreateAsync(User user) =>
         await _users.InsertOneAsync(user);