message: README: adds license text
diff: @@ -217,3 +217,19 @@ brew install freetype fontconfig harfbuzz boost qt5
  * [console\_codes](http://man.he.net/man4/console_codes) Linux console codes
  * [Summary of ANSI standards for ASCII terminals](http://www.inwap.com/pdp10/ansicode.txt)
  * [Text Terminal HOWTO (Chapter 7.2, PTY)](http://tldp.org/HOWTO/Text-Terminal-HOWTO-7.html#ss7.2)
  +
  +### License
  +
  +```
  +Contour - A modern C++ Terminal Emulator
  +-------------------------------------------
  +
  +Licensed under the Apache License, Version 2.0 (the "License");
  +you may not use this file except in compliance with the License.
  +
  +Unless required by applicable law or agreed to in writing, software
  +distributed under the License is distributed on an "AS IS" BASIS,
  +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  +See the License for the specific language governing permissions and
  +limitations under the License.
  +```
  