update read me

Author: adam-singer

README.md

@@ -2,3 +2,71 @@
 
 Port of the [diff.js](http://hg.opensource.lshift.net/synchrotron/file/default/) 
 library. 
+
+### Example using bin/diff.dart
+
+```
+–(~/dart/diff)–($ dart bin/diff.dart /tmp/a.txt /tmp/o.txt /tmp/b.txt 
+diff3_dig: /tmp/a.txt, /tmp/o.txt, /tmp/b.txt
+AA
+a
+<<<<<<<<<
+b
+=========
+d
+>>>>>>>>>
+c
+ZZ
+<<<<<<<<<
+new
+00
+a
+a
+=========
+11
+>>>>>>>>>
+M
+z
+z
+99
+```
+
+Where the following input files are 
+
+```
+–(~/dart/diff)–($ cat /tmp/a.txt 
+AA
+a
+b
+c
+ZZ
+new
+00
+a
+a
+M
+99
+```
+
+```
+–(~/dart/diff)–($ cat /tmp/o.txt 
+AA
+ZZ
+00
+M
+99
+```
+
+```
+–(~/dart/diff)–($ cat /tmp/b.txt 
+AA
+a
+d
+c
+ZZ
+11
+M
+z
+z
+99
+```