Create npm.md

Author: rprieto

common/npm.md

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+# npm
+
+> Node package manager, to manage Node.js projects and install module dependencies.
+
+- Create a new project in the current folder
+
+`npm init`
+
+- Download all dependencies referenced in package.json
+
+`npm install`
+
+- Download a given dependency, and add it to the package.json
+
+`npm install {{module_name}}@{{version}} --save`
+
+- Set the version of the current project
+
+`npm version {{1.2.3}}`
+
+- Publish the current project
+
+`npm publish`