Add a copy of the GPL to the repo

LICENSE.txt

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+                    GNU GENERAL PUBLIC LICENSE
+		                           Version 3, 29 June 2007
+
+ Copyright (C) 2007 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.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
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+  The licenses for most software and other practical works are designed
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+
+  If the Program specifies that a proxy can decide which future
+  versions of the GNU General Public License can be used, that proxy's
+  public statement of acceptance of a version permanently authorizes you
+  to choose that version for the Program.
+
+  Later license versions may give you additional or different
+  permissions.  However, no additional obligations are imposed on any
+  author or copyright holder as a result of your choosing to follow a
+  later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+  APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+  HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+  OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+  PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+  IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+  ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+  WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+  THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+  GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+  USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+  DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+  PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+  EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+  SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+  above cannot be given local legal effect according to their terms,
+  reviewing courts shall apply local law that most closely approximates
+  an absolute waiver of all civil liability in connection with the
+  Program, unless a warranty or assumption of liability accompanies a
+  copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+  possible use to the public, the best way to achieve this is to make it
+  free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+  to attach them to the start of each source file to most effectively
+  state the exclusion of warranty; and each file should have at least
+  the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+        Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+        it under the terms of the GNU General Public License as published by
+	    the Free Software Foundation, either version 3 of the License, or
+	        (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+        but WITHOUT ANY WARRANTY; without even the implied warranty of
+	    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	        GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+        along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+  notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+        This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+	    This is free software, and you are welcome to redistribute it
+	        under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+  if any, to sign a "copyright disclaimer" for the program, if necessary.
+  For more information on this, and how to apply and follow the GNU GPL, see
+  <http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+  into proprietary programs.  If your program is a subroutine library, you
+  may consider it more useful to permit linking proprietary applications with
+  the library.  If this is what you want to do, use the GNU Lesser General
+  Public License instead of this License.  But first, please read
+  <http://www.gnu.org/philosophy/why-not-lgpl.html>.
+