Change default license to the Zsh license (as discussed on zsh-worker…

…s mailing-list)

LICENSE

@@ -0,0 +1,25 @@
+The Z Shell is copyright (c) 1992-2017 Paul Falstad, Richard Coleman,
+Zoltán Hidvégi, Andrew Main, Peter Stephenson, Sven Wischnowsky, and
+others.  All rights reserved.  Individual authors, whether or not
+specifically named, retain copyright in all changes; in what follows, they
+are referred to as `the Zsh Development Group'.  This is for convenience
+only and this body has no legal status.  The Z shell is distributed under
+the following licence; any provisions made in individual files take
+precedence.
+
+Permission is hereby granted, without written agreement and without
+licence or royalty fees, to use, copy, modify, and distribute this
+software and to distribute modified versions of this software for any
+purpose, provided that the above copyright notice and the following
+two paragraphs appear in all copies of this software.
+
+In no event shall the Zsh Development Group be liable to any party for
+direct, indirect, special, incidental, or consequential damages arising out
+of the use of this software and its documentation, even if the Zsh
+Development Group have been advised of the possibility of such damage.
+
+The Zsh Development Group specifically disclaim any warranties, including,
+but not limited to, the implied warranties of merchantability and fitness
+for a particular purpose.  The software provided hereunder is on an "as is"
+basis, and the Zsh Development Group have no obligation to provide
+maintenance, support, updates, enhancements, or modifications.

README.md

@@ -64,11 +64,12 @@ Contributions are welcome, just make sure you follow the guidelines:
  * Completions are not accepted when already available in their original project.
  * Please do not just copy/paste someone else completion, ask before.
  * Completions only partially implemented are not accepted.
- * Please add a header containing authors, license info, status and origin of the script (example [here](src/_ack)).
+ * Please add a header containing authors, status and origin of the script and license header if you do not wish to use the Zsh license (example [here](src/_ack)).
  * Please try to follow [Zsh completion style guide](https://github.com/zsh-users/zsh/blob/master/Etc/completion-style-guide).
  * Please send one separate pull request per file.
  * Send a pull request or ask for committer access.
 
 
 ## License
-See each file for license details.
+Completions use the Zsh license, unless explicitely mentionned in the file header.
+See [LICENSE](https://github.com/zsh-users/zsh-completions/blob/master/LICENSE) for more information.