Adding dependency to TMP in SDK

Author: Railboy

Assets/MixedRealityToolkit.SDK/MixedRealityToolkit.SDK.asmdef

@@ -3,7 +3,8 @@
     "references": [
         "Microsoft.MixedReality.Toolkit",
         "Microsoft.MixedReality.Toolkit.Core.Utilities.Async",
-        "Microsoft.MixedReality.Toolkit.Services.InputSystem"
+        "Microsoft.MixedReality.Toolkit.Services.InputSystem",
+        "Unity.TextMeshPro"
     ],
     "optionalUnityReferences": [],
     "includePlatforms": [],