Add license terms to README

Fixes #88

Author: hroncok

LICENSE.MIT

@@ -0,0 +1,23 @@
+The MIT License (MIT)
+
+Copyright (c) 2016-2017 naucse.python.cz contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+Provided license texts might have their own copyrights and restrictions
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

@@ -3,3 +3,19 @@
 Materiály pro české PyLadies vytažené do samostatného repa.
 
 Brzy dostupné na naucse.python.cz.
+
+
+## License
+
+The code is licensed under the terms of the MIT license, see [LICNESE.MIT] file
+for full text. By contributing code to this repository, you agree to have it
+licensed under the same license.
+
+Content has its own license specified in the appropriate matadata.
+Only [free content licenses] are used. By contributing to an already licensed
+document, you agree to have it licensed under the same license.
+(And feel free to add yourself to the authors list in its metadata.)
+When contributing new document(s) a license must be specified in the metadata.
+
+[LICNESE.MIT]: https://github.com/pyvec/naucse.python.cz/blob/master/LICNESE.MIT
+[free content licenses]: https://en.wikipedia.org/wiki/List_of_free_content_licenses