Add IPlatformIdentifier

src/Tgstation.Server.Host/Core/IPlatformIdentifier.cs

@@ -0,0 +1,13 @@
+namespace Tgstation.Server.Host.Core
+{
+	/// <summary>
+	/// For identifying the current platform
+	/// </summary>
+	interface IPlatformIdentifier
+	{
+		/// <summary>
+		/// If the current platform is a Windows platform
+		/// </summary>
+		bool IsWindows { get; }
+	}
+}