Start adding API endpoints

Environment/Service/Models/Readings.cs

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+namespace ChrisKaczor.HomeMonitor.Environment.Service.Models;
+
+public class Readings
+{
+    public DateTimeOffset Time { get; set; }
+
+    public string? Name { get; set; }
+
+    public string? Model { get; set; }
+
+    public decimal AirQualityIndex { get; set; }
+
+    public decimal ColorTemperature { get; set; }
+
+    public decimal GasResistance { get; set; }
+
+    public decimal Humidity { get; set; }
+
+    public decimal Luminance { get; set; }
+
+    public decimal Pressure { get; set; }
+
+    public decimal Temperature { get; set; }
+}