Add "ZoneSettings" extensions

Extensions/Cloudflare.Zones/Models/Settings/BrowserCacheTTL.cs

@@ -0,0 +1,23 @@
+namespace AMWD.Net.Api.Cloudflare.Zones
+{
+	/// <summary>
+	/// Control how long resources cached by client browsers remain valid.
+	/// </summary>
+	public class BrowserCacheTTL : ZoneSettingBase
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="BrowserCacheTTL"/> class.
+		/// </summary>
+		public BrowserCacheTTL()
+		{
+			Id = ZoneSettingId.BrowserCacheTTL;
+		}
+
+		/// <summary>
+		/// The number of seconds to cache resources for.
+		/// The API prohibits setting this to 0 for non-Enterprise domains.
+		/// </summary>
+		[JsonProperty("value")]
+		public int? Value { get; set; }
+	}
+}