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/envConstants.js b/src/envConstants.js
new file mode 100644
index 0000000..f9a4c3c
--- /dev/null
+++ b/src/envConstants.js
@@ -0,0 +1,5 @@
+const envName = process.env.VUE_APP_ENV_NAME;
+
+export const ENV_CONSTANTS = {
+  name: envName || 'openbmc'
+};