Add GPL license files and README.md.

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Change-Id: I9dd72c9008afb53a33af0dd19e5a930f6b239de4

Author: t-14

COPYING.RUNTIME

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+GCC RUNTIME LIBRARY EXCEPTION
+
+Version 3.1, 31 March 2009
+
+Copyright (c) 2009 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license
+document, but changing it is not allowed.
+
+This GCC Runtime Library Exception ("Exception") is an additional permission
+under section 7 of the GNU General Public License, version 3 ("GPLv3"). It
+applies to a given file (the "Runtime Library") that bears a notice placed
+by the copyright holder of the file stating that the file is governed by
+GPLv3 along with this Exception.
+
+When you use GCC to compile a program, GCC may combine portions of certain
+GCC header files and runtime libraries with the compiled program. The
+purpose of this Exception is to allow compilation of non-GPL (including
+proprietary) programs to use, in this way, the header files and runtime
+libraries covered by this Exception.
+
+0. Definitions.
+
+A file is an "Independent Module" if it either requires the Runtime Library
+for execution after a Compilation Process, or makes use of an interface
+provided by the Runtime Library, but is not otherwise based on the Runtime
+Library.
+
+"GCC" means a version of the GNU Compiler Collection, with or without
+modifications, governed by version 3 (or a specified later version) of the
+GNU General Public License (GPL) with the option of using any subsequent
+versions published by the FSF.
+
+"GPL-compatible Software" is software whose conditions of propagation,
+modification and use would permit combination with GCC in accord with the
+license of GCC.
+
+"Target Code" refers to output from any compiler for a real or virtual
+target processor architecture, in executable form or suitable for input to
+an assembler, loader, linker and/or execution phase. Notwithstanding that,
+Target Code does not include data in any format that is used as a compiler
+intermediate representation, or used for producing a compiler intermediate
+representation.
+
+The "Compilation Process" transforms code entirely represented in
+non-intermediate languages designed for human-written code, and/or in Java
+Virtual Machine byte code, into Target Code. Thus, for example, use of
+source code generators and preprocessors need not be considered part of the
+Compilation Process, since the Compilation Process can be understood as
+starting with the output of the generators or preprocessors.
+
+A Compilation Process is "Eligible" if it is done using GCC, alone or with
+other GPL-compatible software, or if it is done without using any work based
+on GCC. For example, using non-GPL-compatible Software to optimize any GCC
+intermediate representations would not qualify as an Eligible Compilation
+Process.
+
+1. Grant of Additional Permission.
+
+You have permission to propagate a work of Target Code formed by combining
+the Runtime Library with Independent Modules, even if such propagation would
+otherwise violate the terms of GPLv3, provided that all Target Code was
+generated by Eligible Compilation Processes. You may then convey such a
+combination under terms of your choice, consistent with the licensing of the
+Independent Modules.
+
+2. No Weakening of GCC Copyleft.
+
+The availability of this Exception does not imply any general presumption
+that third-party software is unaffected by the copyleft requirements of the
+license of GCC.