GUI extension Yeoman generator

Change-Id: If6b3fae44e4ee8a7bde36600cdc71d54d49fbf6e
(cherry picked from commit 3ca3e2086046a61b3f58813e7cb9052a600e2323)
diff --git a/generator-xos-gui-extension/.gitignore b/generator-xos-gui-extension/.gitignore
new file mode 100644
index 0000000..9ba488b
--- /dev/null
+++ b/generator-xos-gui-extension/.gitignore
@@ -0,0 +1,2 @@
+*.DS_Store
+node_modules/