Add mage2me description and token information

Author: Tyler Mills

README.md

@@ -1,6 +1,11 @@
 # mage2me
 
-Magento 2 Downloader for Commerce & Open Source
+mage2me is a download helper for Mageno 2 Commerce and Open Source. The tool allows you to not only specify the Magento edition but also any tag or branch version available in the Magento composer repository. If that's not enough, it will also validate your Magento and Github access tokens to ensure you're on the right path.
+
+Go ahead and grab your tokens before getting started:
+
+- Magento: https://marketplace.magento.com/customer/accessKeys/
+- Github: https://github.com/settings/tokens
 
 Download mage2me
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