start of adding package docs

README.md

@@ -172,7 +172,19 @@ To create a new MEAN app, run <code>mean init</code>. Name for the application i
 ```
 
 ## Packages
+
 Everything in mean.io is a package and when extending mean with custom functionality make sure you create your own package and do not alter the core packages.
+
+The mean.io package system allows developers to create modular code that provides useful tools that other mean developers can use. The packages, when published, are plug-and-play and are used in a way very similar to traditional npm packages.
+
+The meanio package system integrates all the packages into the mean project as if the code was part of mean itself and provides the developers with all the necceesary tools required to integrate their package into the host project.
+
+There are two types of packages:
+
+**Custom Packages** are generated by the mean scaffolder and contain most of your application logic. Custom packages are found in /packages and can be published as a contrib package for use by other developers.
+
+**Contrib Packages** are installed by the mean installer and are found at /node_modules. Contrib packages are "plug and play".
+
 ### Core Packages
 #### System
 coming soon