Update front.md

Author: Limiana

meta/front.md

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 - Assign and reassign your deployables in one click as well.
 - Create sell lists and get rid of junk items automatically.
 - Create entrust lists and entrust valuable items to your retainers for storage efficiency.
+
+## Usage guidelines
+- You are permitted to use AutoRetainer only for non-commercial purposes. It is prohibited to sell AutoRetainer or products that have been produced with the help of AutoRetainer. Furthermore, if you are using AutoRetainer in conjunction with third party software, you must ensure that such usage will not be against terms of service of third party software in question. You will not receive support if it's found that you break these guidelines.