Added some useful information to the readme

Author: Cory Fowler

README.md

@@ -1 +1,33 @@
+# Azure App Service Web App Composer Site Extension
 
+This site extension adds [Composer](http://getcomposer.org) support to Web App to enable dependency management for PHP applications.
+
+## Installation
+
+Follow the instructions outlined in the article [How to enable a Site Extension in Azure App Service Web App](http://blog.syntaxc4.net/post/2015/02/05/how-to-enable-a-site-extension-in-azure-websites.aspx) when selecting an extension look for the list item for [Composer](http://www.siteextensions.net/packages/ComposerExtension/).
+
+## Usage
+
+There are multiple ways to use Composer from Web App.
+
+### Continuous Deployment
+
+This sample application demonstrates the usage of the `composer.json` file in Web App.
+
+* Place a `composer.json` file in the root of your repository
+* vendor folder will be created in `d:\home\site\vendor`
+* reference to the autoload.php file `require_once "../vendor/autoload.php";`
+
+### Command-Line
+
+* Open the Kudu Debug Console (http://<site-name>.scm.azurewebsites.net/DebugConsole) or Install [KuduExec](https://github.com/projectkudu/kuduexec)
+* run composer from the command line `composer selfupdate`
+
+## AppSettings
+
+| Name                | Value                                 |Notes                                     |
+|---------------------|---------------------------------------|------------------------------------------|
+| APPSETTING_COMMAND  | %XDT_EXTENSIONPATH%\Hooks\deploy.cmd  | Deployment Hook Command. (causes .deployment file not to function [[bug](https://github.com/projectkudu/kudu/issues/1519)])                |
+| PATH                | %PATH%;%XDT_EXTENSIONPATH%\Commands   | Overwrites the Path. Last Extension Wins |
+| COMPOSER_ARGS       | --prefer-dist --no-dev --optimize-autoloader --no-progress  |  Command line arguments for composer during deploy.cmd execution |
+| COMPOSER_VENDOR_DIR | d:\home\site\vendor\                  | Moves the vendor folder out of wwwroot for security purposes.