added a README.txt

diff --git a/apps/tests/TestPowerup/README.txt b/apps/tests/TestPowerup/README.txt
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+$Id$
+
+README for TestPowerup
+Author/Contact: tinyos-help@millennium.berkeley.edu
+
+Description:
+
+The TestPowerup application turns on LED 0 when the mote boots successfully,
+i.e. when MainC signals the booted event. It is a useful sanity test when
+developing a new platform.
+
+Tools:
+
+None.
+
+Known bugs/limitations:
+
+None.
+ 
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