[docs] Add LICENSE.txt to the root of the mono-repo

This will make it easier to find the LICENSE and some
software also looks in the root to automatically find it.

Reviewed By: kristof.beyls, lattner

Differential Revision: https://reviews.llvm.org/D132018

Author: tru

LICENSE.TXT

@@ -0,0 +1,279 @@
+==============================================================================
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