Test README files.

git-svn-id: https://svn.code.sf.net/p/goodfet/code/trunk@21 12e2690d-a6be-4b82-a7b7-67c4a43b65c8

diff --git a/firmware/tests/blink/README.txt b/firmware/tests/blink/README.txt
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+Simple blink test.  Doesn't require a crystal, UART, or anything else.
+

diff --git a/firmware/tests/echo/README.txt b/firmware/tests/echo/README.txt
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+This is a test case that echoes any byte it receives back to the sender.
+Useful for debugging the UART.
+