npm install instructions

Author: miguelsousa

README.md

@@ -10,8 +10,10 @@ by using the AFDKO makeotf tool.
 * [Mac OS X](http://support.apple.com/kb/HT2509)
 * [Windows](https://www.microsoft.com/en-us/Typography/TrueTypeInstall.aspx)
 * [Linux/Unix-based systems](https://github.com/adobe-fonts/source-code-pro/issues/17#issuecomment-8967116)
-* Bower: run the following command,<br/>
+* Bower<br/>
 	`bower install git://github.com/adobe-fonts/source-code-pro.git#release`
+* npm<br/>
+	`npm install --fetch-only git://github.com/adobe-fonts/source-code-pro.git#release`
 
 ## Getting Involved