docs: add a LICENSE on the main GitHub page

Fix openwall#4467

Signed-off-by: Claudio André <dev@claudioandre.slmail.me>

LICENSE

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+ John the Ripper copyright and license.
+
+John the Ripper password cracker,
+Copyright (c) 1996-2024 by Solar Designer and others
+
+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 2 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.
+
+As a special exception to the GNU General Public License terms,
+permission is hereby granted to link the code of this program, with or
+without modification, with any version of the OpenSSL library and/or any
+version of unRAR, and to distribute such linked combinations. You must
+obey the GNU GPL in all respects for all of the code used other than
+OpenSSL and unRAR. If you modify this program, you may extend this
+exception to your version of the program, but you are not obligated to
+do so. (In other words, you may release your derived work under pure
+GNU GPL version 2 or later as published by the FSF.)
+
+(This exception from the GNU GPL is not required for the core tree of
+John the Ripper, but arguably it is required for -jumbo.)
+
+
+ Relaxed terms for certain components.
+
+In addition or alternatively to the license above, many components are
+available to you under more relaxed terms (most commonly under cut-down
+BSD license) as specified in the corresponding source files.
+
+Furthermore, as the copyright holder for the bcrypt (Blowfish-based
+password hashing) implementation found in John the Ripper, I have placed
+a derived version of this implementation in the public domain. This
+derived version may be obtained at:
+
+ https://www.openwall.com/crypt/
+
+The intent is to provide modern password hashing for your servers and
+your software (where the GPL restrictions could be a problem).
+
+
+ Commercial licensing.
+
+Commercial licenses (non-GPL) are available upon request.
+
+
+ Copyright holder contact information.
+
+For the core John the Ripper tree:
+
+Alexander Peslyak aka Solar Designer <solar at openwall.com>
+
+(There are additional copyright holders for "community enhanced" -jumbo
+versions of John the Ripper.)

doc/LICENSE

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+../LICENSE