Added readme

Author: daviesgeek

README.md

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+# guetzli-gui
+
+A super simple GUI for Google's JPEG encoder [guetzli](https://github.com/google/guetzli). This is not associated with Google at all.
+
+![Gui preview](guetzli-gui.png)
+
+To install, first install the guetzli command line tool by following [the installation instructions.](https://github.com/google/guetzli#on-macos). Then, either [download the pre-built application](https://github.com/daviesgeek/guetzli-gui/releases), or build from source by using Xcode.
+
+## License
+
+MIT License
+
+Copyright (c) 2017 Matthew Davies
+
+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.