Add Clear The Screen as a zsh til.

README.md

@@ -55,6 +55,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 
 ### zsh
 
+- [Clear The Screen](zsh/clear-the-screen.md)
 - [Search History](zsh/search-history.md)
 
 ## About

zsh/clear-the-screen.md

@@ -0,0 +1,7 @@
+# Clear The Screen
+
+If you type `clear` into your shell, the screen will be cleared. There is a
+handy keybinding though that will save you a few keystrokes. Just hit
+`ctrl-l` to achieve the same effect.
+
+source: [Derek P.](https://twitter.com/DerkTheDaring)