Added some comments about pin-usage to 2 other files including the readme #195
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Took me some time to figure out that the pins differ from board to board. Comments would help.
Added some comment lines for pins used.
No code-change
A4, A5 on a UNO, 20,21 on a MEGA.
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Added also comments about pin-usage to the 128 x 64 example and to the readme.