Implement first iteration of players tab (chat/player list) and sketch API

PistonAPI/PistonAPI.cs

@@ -3,11 +3,13 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows.Controls;
 
 namespace PistonAPI
 {
     public static class PistonAPI
     {
-
+        public static IServerControls ServerControls { get; }
+        public static IEnvironmentInfo EnvironmentInfo { get; }
     }
 }