Added the text GNU General Public License v2.0 so that the users need not click LICENSE.

Hi @jayaramcloud!

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

We have rewritten the README.md for the Sapling launch, so this diff is out of date.

Further, while the bulk of the code in the repository is GPLv2, the addons/ and website/ folders are MIT licensed, so this is not completely accurate.