Add "ZoneSettings" extensions

Extensions/Cloudflare.Zones/Models/Settings/TLS1_2Only.cs

@@ -0,0 +1,22 @@
+namespace AMWD.Net.Api.Cloudflare.Zones
+{
+	/// <summary>
+	/// Only allows TLS1.2.
+	/// </summary>
+	public class TLS1_2Only : ZoneSettingBase
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="TLS1_2Only"/> class.
+		/// </summary>
+		public TLS1_2Only()
+		{
+			Id = ZoneSettingId.TLS1_2Only;
+		}
+
+		/// <summary>
+		/// Current value of the zone setting.
+		/// </summary>
+		[JsonProperty("value")]
+		public OnOffState Value { get; set; }
+	}
+}