updating docs

docs/scripting.md

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+### Scripting
+There is often an occasion where you need to run a script on code to do a transformation once code lands in the container. For this reason we have developed scripting support. By including a scripts folder in your git repository and passing the __RUN_SCRIPTS=1__ flag to your command line the container will execute your scripts. Please see the [repo layout guidelines](https://github.com/ngineered/nginx-php-fpm/blob/master/docs/repo_layout.md) for more details on how to organise this.
+
+### Using environment variables / templating
+To set the variables pass them in as environment variables on the docker command line.
+Example:
+```
+sudo docker run -d -e 'YOUR_VAR=VALUE' richarvey/nginx-php-fpm
+```
+You can then use PHP to get the environment variable into your code:
+```
+string getenv ( string $YOUR_VAR )
+```
+Another example would be:
+```
+<?php
+echo $_ENV["APP_ENV"];
+?>
+```