added extension skeleton

src/ext/skeleton/main.lua

@@ -0,0 +1,24 @@
+local api = ...
+
+return {
+  name = "skeleton",
+  enabled = true,
+
+  init = function() end,
+
+  update = function()
+    local iui = api.iui
+    local backend = api.backend 
+    local mainWindow = api.mainWindow
+  end,
+
+  load = function() end,
+
+  draw = function(pass) 
+    if api.iui.idiom == "vr" then
+
+    else
+
+    end
+  end
+}