add a readme

Author: tikiatua

build/readme.md

@@ -0,0 +1,13 @@
+# Vuex-i18n build directory
+
+This directory contains the specifications and code to build the vuex-i18n 
+plugin using rollup.
+
+Building requires a current installation of yarn and nodejs.
+
+1. Install all required node_modules with `yarn install`
+2. Run the build script with `yarn run build`
+
+The build script will create a symlink to the ../src directory in the build
+directory. This is required to transpile the code with babeljs, as babeljs only
+works well with directories that are in the same root as the babelrc file.