tools: Add pd, a test tool for libpldm

As per the comment in the implementation:

> `grep 'p.*l.*d.*m' /usr/share/dict/words` found 'palladium', which has
> element symbol Pd.

Change-Id: Idbfb15e33

tools: Add pd, a test tool for libpldm

As per the comment in the implementation:

> `grep 'p.*l.*d.*m' /usr/share/dict/words` found 'palladium', which has
> element symbol Pd.

Change-Id: Idbfb15e3382cccb0fde48dc2d5ee8de14fc30816
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

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