Add project files.

CalendarReminder.Api/Controllers/UsersController.cs

@@ -0,0 +1,34 @@
+using CalendarReminder.Api.Data;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace CalendarReminder.Api.Controllers;
+
+[Authorize]
+[ApiController]
+[Route("api/[controller]")]
+public class UsersController : ControllerBase
+{
+    private readonly AppDbContext _db;
+
+    public UsersController(AppDbContext db) => _db = db;
+
+    // GET api/users?search=jan
+    [HttpGet]
+    public async Task<IActionResult> Search([FromQuery] string? search)
+    {
+        var myId = int.Parse(User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)!.Value);
+
+        var query = _db.Users.Where(u => u.Id != myId);
+        if (!string.IsNullOrWhiteSpace(search))
+            query = query.Where(u => u.Username.Contains(search) || u.Email.Contains(search));
+
+        var users = await query
+            .Select(u => new { u.Id, u.Username, u.Email })
+            .Take(20)
+            .ToListAsync();
+
+        return Ok(users);
+    }
+}