Start adding API endpoints

Environment/Service/Controllers/ReadingsController.cs

@@ -0,0 +1,35 @@
+using ChrisKaczor.HomeMonitor.Environment.Service.Data;
+using ChrisKaczor.HomeMonitor.Environment.Service.Models;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ChrisKaczor.HomeMonitor.Environment.Service.Controllers;
+
+[Route("[controller]")]
+[ApiController]
+public class ReadingsController(Database database) : ControllerBase
+{
+    [HttpGet("recent")]
+    public async Task<ActionResult<IEnumerable<Readings>>> GetRecent([FromQuery] string? tz)
+    {
+        var recentReadings = await database.GetRecentReadings();
+
+        if (string.IsNullOrWhiteSpace(tz))
+            return Ok(recentReadings);
+
+        try
+        {
+            var timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById(tz);
+
+            foreach (var recentReading in recentReadings)
+            {
+                recentReading.Time = recentReading.Time.ToOffset(timeZoneInfo.GetUtcOffset(recentReading.Time));
+            }
+        }
+        catch (Exception e)
+        {
+            return BadRequest(e.Message);
+        }
+
+        return Ok(recentReadings);
+    }
+}