devguides: draft add add_aux_pow to daemon rpc draft

[plowsof]

closes #1529 missing response / definitions / a valid id/hash for the aux_pow vector

Alias: None. todo

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[erciccione]

@plowsof what's the status of this pr?

[plowsof]

status is i need to figure out (probably ask for help) how to use (what the correct params are) and obtain a valid return.

[plowsof]

@erciccione rebased, added correct inputs for a sane output. ready for review