Add Swift Shift app (#1547)

Author: pablopunk

README.md

@@ -1165,6 +1165,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
 * [Sidebar](http://sidebarapp.net/) - The modern Dock replacement for your Mac.
 * [SizeUp](http://www.irradiatedsoftware.com/sizeup/) - Powerful, keyboard-centric window management.
 * [Slate](https://github.com/jigish/slate) - Window management application similar to Divvy and SizeUp (except better and free!). (**Needs config file**) [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/jigish/slate)
+* [Swift Shift](https://swiftshift.app) - Use your mouse with a keyboard shortcut to move and resize your windows quickly. It offers options to customize the draggable areas and mouse behavior. [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/pablopunk/swiftshift)
 * [Tiles](https://freemacsoft.net/tiles/) - Easily reorganize windows by either dragging them to the edges of the screen, using keyboard shortcuts, or the menu bar. ![Freeware][Freeware Icon]
 * [Total Spaces](http://totalspaces.binaryage.com/) - Provides window management much like ubuntu. Creates hotkeys for workspaces which allows you to easily move around.
 * [yabai](https://github.com/koekeishiya/yabai) - Tiling window manager for macOS. A rewrite of chunkwm, it provides a more seamless integration with the operating system. [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/koekeishiya/yabai/wiki)