boards: Add Genio 700 EVK board documentation

Signed-off-by: Ariel D'Alessandro ariel.dalessandro@collabora.com

added 2 commits

• edfa0344 - 1 commit from branch main
• 13f17dfb - boards: Add Genio 700 EVK board documentation

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@dougtargett ah! I didn't see you already documented the board in edfa0344 Shall we merge them? Maybe drop the genio-tools part as not needed anymore?

@dougtargett let me know what you think, if you rather drop this, replace o merge? :-)