Adding simple README.

README.md

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+# Attribution
+
+This code is based on an anonymous contribution at http://hints.macworld.com/article.php?story=2008051406323031.
+
+It was updated by Steven Merrill to compile without deprecation warnings on Mac OS X 10.6.
+
+# About
+
+This program is a slightly updated version of the code at http://hints.macworld.com/article.php?story=2008051406323031.
+
+It will build a "click" binary that can be used inside of AppleScripts (and the like) to click the mouse under Mac OS X.
+
+# Building the code
+
+I plan to make a Makefile, but for now, ```gcc -o click click.m -framework ApplicationServices -framework Foundation```.
+
+# Usage
+
+```click -x [x coordinate] -y [y coordinate]```
+
+If no value is specified, 0 will be used.
+