GUI -- Beginnings of new file structure / Angular implementation. WIP.

Change-Id: Ic79347b41292432605cd30bf1d4920063f6602e8
diff --git a/web/gui/src/main/webapp/appext/README.txt b/web/gui/src/main/webapp/appext/README.txt
new file mode 100644
index 0000000..ce9e361
--- /dev/null
+++ b/web/gui/src/main/webapp/appext/README.txt
@@ -0,0 +1,2 @@
+The 'appext' directory is for "Application Extensions". That is to say,
+this would be the path to applications contributing to the GUI.