Convert serial reader from console to web API

Weather/SerialReader/Controllers/HealthController.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Mvc;
+using System;
+
+namespace ChrisKaczor.HomeMonitor.Weather.SerialReader.Controllers
+{
+    [Route("[controller]")]
+    [ApiController]
+    public class HealthController : ControllerBase
+    {
+        private readonly TimeSpan _checkTimeSpan = TimeSpan.FromSeconds(5);
+
+        [HttpGet("ready")]
+        public IActionResult Ready()
+        {
+            return SerialReader.BoardStarted ? Ok() : Conflict();
+        }
+
+        [HttpGet("health")]
+        public IActionResult Health()
+        {
+            var lastReading = SerialReader.LastReading;
+            var timeSinceLastReading = DateTimeOffset.UtcNow - lastReading;
+
+            return timeSinceLastReading <= _checkTimeSpan ? Ok(lastReading) : BadRequest(lastReading);
+        }
+    }
+}