Update the readme

Author: HackerPoet

README.md

@@ -1,2 +1,15 @@
 # Trackpad
-Turns a Keyboard into a Trackpad
+Turns any keyboard into a trackpad.
+
+[**Download (Windows 64bit)**](https://github.com/HackerPoet/Trackpad/raw/master/Trackpad.zip)
+
+[**YouTube Video**](https://youtu.be/JQJaJFZYPvI)
+
+## How To Use
+* You need a keyboard layout image "layout.png".  I included an example in the zip file.
+* Next, label the keys.  Press "F2" to start the editor mode.  Click on the top left of a key, then the bottom right, then type the key.  Do this for all keys you want to use.
+* Press "S" to save your key labels to "layout.bin".  I included an example of this as well.
+* Press "F2" to switch back to idle.
+* You can now toggle the keyboard on and off with "F1".
+* Drag a finger over the keyboard to move the mouse.  Double-tap a key to click or start dragging.  2 fingers scroll.
+* "Esc" will always shut down the app and release the hook in case you get stuck.