Add TODO file

diff --git a/TODO b/TODO
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+++ b/TODO
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+TODO:
+- add support for GPIO2 and GPIO3 of PL2303, see also
+  https://patchwork.kernel.org/patch/4815351/
+- add debug code for testing FT232R, especially reading GPIO configuration
+- test mixed input and output with FT232R and PL2303
+- ...