Doc for new unit 'goldpinger'

Akshay yadavrequested to merge
ak-doc-goldpinger into main

This MR adds the doc for a new unit goldpinger.

Dependent MR: sylva-core!4686 (merged)

Closes #141 (closed)

cc @satyawanj @marc.bailly1 @matrohon @vladonutu

Edited by Akshay yadav

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