Add NPM package instructions

ValentinH · ValentinH · commit 06a4922eff4a · 2015-10-13T13:47:44.000+02:00
diff --git a/README.md b/README.md
@@ -14,6 +14,11 @@ Make sure the report is accompanied by a reproducible demo. The ideal demo is cr
 
 ## Installation
 
+### NPM
+```
+npm i angularjs-slider
+```
+or
 ### Bower
 ```
 $ bower install --save angularjs-slider
