docs(commondao): add README.md

[jeronimoalbi]

Adds an initial README.md to better document the commondao package

[Gno2D2]

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[leohhhn]

LGTM, leaving just one suggestion

[thehowl]

@jeronimoalbi Do you want to wait for a second review from Michelle, or do you think we're good to merge?

[jeronimoalbi]

@thehowl we're good to merge 👍