Add API to get most recent reading

Weather/Service/Controllers/ReadingsController.cs

@@ -0,0 +1,25 @@
+using ChrisKaczor.HomeMonitor.Weather.Models;
+using ChrisKaczor.HomeMonitor.Weather.Service.Data;
+using Microsoft.AspNetCore.Mvc;
+using System.Threading.Tasks;
+
+namespace ChrisKaczor.HomeMonitor.Weather.Service.Controllers
+{
+    [Route("[controller]")]
+    [ApiController]
+    public class ReadingsController : ControllerBase
+    {
+        private readonly Database _database;
+
+        public ReadingsController(Database database)
+        {
+            _database = database;
+        }
+
+        [HttpGet("recent")]
+        public async Task<ActionResult<WeatherReading>> GetRecent()
+        {
+            return await _database.GetRecentReading();
+        }
+    }
+}