Add MIT (Expat) license

Author: photm5

LICENSE

@@ -0,0 +1,20 @@
+weecrypt, asymmetric encryption for weechat using gpg
+Copyright (c) 2015 shak-mar
+
+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.
+
+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

@@ -111,3 +111,11 @@ communication speed, but you'll have to tolerate that in order to chat
 securely.
 
 [gpg_guide]: http://www.dewinter.com/gnupg_howto/english/GPGMiniHowto.html
+
+## License
+
+This is free software (as in freedom), using the permissive MIT (Expat)
+[license][]. This means you can use, read the source code of, change and
+redistribute weecrypt.
+
+[license]: https://github.com/shak-mar/weecrypt/blob/master/LICENSE