Update README.md

Author: rhukster

README.md

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 # Grav Documentation
+
+This is the repository for all the functionality of http://learn.getgrav.org. It is what we call a **skeleton** in that it's drop-in replacment for the `user/` folder in Grav. 
+
+To install your own copy of the learn site, simply follow these steps:
+
+1. [Download Grav](http://getgrav.org/downloads) from the getgrav.org site
+2. Extract the ZIP archive into a directory in your webroot (e.g. `~/www/grav-learn/`)
+3. [Download](https://github.com/getgrav/grav-learn/archive/develop.zip) and extract, or [Clone](https://github.com/getgrav/grav-learn.git), the **grav-learn** repository as `~/www/grav-learn/user/`
+4. Run `bin/grav install` from the root (e.g. `~/www/grav-learn/`)
+
+At this point the required plugins and vendor libraries should be installed, and your learn site should be fully functional.