Add webpack config for env specific builds

Add documentation and example files to make environment specific
build modifications.

- Store any env specific router and store modules in
  separate env directory

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I06ff3cb0928707354266dd25b399710847e7fa18
diff --git a/src/env/router/openpower.js b/src/env/router/openpower.js
new file mode 100644
index 0000000..dccb2de
--- /dev/null
+++ b/src/env/router/openpower.js
@@ -0,0 +1,6 @@
+import router from '@/router';
+
+// Use router.addRoutes() to add layer specific routes
+// https://router.vuejs.org/api/#router-addroutes
+
+export default router;