Oops, add bat.mdwn intro for bat.sh.

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+[[bat.sh]] is a [[bash]] script to display the available battery charge.
+
+When I'm running X, I usually monitor battery charge with [conky][],
+but I wanted a script to allow quick status checks from the command
+line.
+
+    $ bat.sh
+    Full    4400000/4400000 (100.0%)
+
+[conky]: http://conky.sourceforge.net/
+
+[[!tag tags/bash]]
+[[!tag tags/programming]]