update sass file and update minify and add contributing file

Author: dianedelallee

CONTRIBUTING.md

@@ -0,0 +1,19 @@
+# Contributing
+
+## Note for myself
+
+Before doing a new release*, don't forget to
+1. Change the version of the lib in the README
+2. Change the version in the package.json
+3. rerun `sass --watch source/artemis.scss artemis.css `
+4. minify the css of `artemis.css` and copy past it in `artemis.min.css` 
+
+
+Once those previous steps are done.
+1.Go to github and create the realese with some notes of what have change
+2. Publish the package on NPM
+
+
+Note:
+
+*new release: create the release on github and then publishing on npm 

README.md

@@ -1,6 +1,8 @@
 # Artemis CSS library
 
-version 0.1.3
+A nice css library to provide pastel elements to include in your website.
+
+version 0.1.4
 
 ## CSS class available