Update README to explain how to reduce package size

README.md

@@ -465,6 +465,28 @@ Build the package:
 
 On Android, if you want to generate the Sugarizer OS version, remove the SugarizerOS comment around the `cordova-plugin-sugarizeros` plugin in [config.xml](config.xml) file.
 
+# Reduce package size
+
+The current size of Sugarizer is about 300 Mb. This huge size is related to media content and resources include in two activities:
+
+* **Abecedarium activity**: about 150 Mb
+* **Etoys activity**: about 100 Mb
+
+By the way, both activities are able to retrieve the content remotely if its not deployed locally. So, if you want to reduce the Sugarizer package size (specifically for deployment on mobile) you could either remove completely those two activities or just remove the media content of this activities.
+
+To remove activities, just remove both activities directory and update [activities.json](activities.json) file as explain above.
+
+To remove media content for **Abecedarium**, remove directories:
+
+* [activities/Abecedarium.activity/audio/en](activities/Abecedarium.activity/audio/en)
+* [activities/Abecedarium.activity/audio/fr](activities/Abecedarium.activity/audio/fr)
+* [activities/Abecedarium.activity/audio/es](activities/Abecedarium.activity/audio/es)
+* [activities/Abecedarium.activity/images/database](activities/Abecedarium.activity/images/database)
+
+The activity will look for media content on the server referenced in [activities/Abecedarium.activity/config.js](activities/Abecedarium.activity/config.js), by default `http://server.sugarizer.org/activities/Abecedarium.activity/`.
+
+To remove resources for **Etoys**, remove directory [activities/Etoys.activities/resources](activities/Etoys.activities/resources) and replace the value `resources/etoys.image` in [activities/Etoys.activities/index.html](activities/Etoys.activities/index.html) by the remote location of the resources, for example `http://server.sugarizer.org/activities/Etoys.activity/resources/etoys.image`.
+
 # Localization
 
 Sugarizer use [webL10n](https://github.com/fabi1cazenave/webL10n) localization system by Fabien Cazenave.