Include documentation in the application

doc/assets.markdown

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+How to build assets (Javascript and CSS files)
+==============================================
+
+Stylesheet and Javascript files are merged together and minified.
+
+- Original CSS files are stored in the folder `assets/css/src/*.css`
+- Original Javascript code is stored in the folder `assets/js/src/*.js`
+
+Requirements
+------------
+
+- Unix operating system
+- make
+- yuicompressor in your path (`brew install yuicompressor`)
+
+Build assets
+------------
+
+- Build Stylesheet files: `make css`
+- Build Javascript files: `make js`
+- Build both: `make`
+
+This script generates the files `assets/css/app.css` and `assets/js/app.js`.
+
+This tool is only available in the repository (development version).