doc: find usefull plugins

• Find usefull plugins to build a community
• Test them on dev server
• Document them on README.md

Howto install a plugin : https://meta.discourse.org/t/install-plugins-in-discourse/19157

Some ideas :

• resolve
• calendar
• member map
• birthday
• etc.

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assigned to @julie_thezenas

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created merge request !2 (merged) to address this issue

mentioned in merge request !2 (merged)

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marked the checklist item Find usefull plugins to build a community as completed

marked the checklist item Test them on https://forum.dev.apps.coprodespossibles.fr/ as completed

marked the checklist item Document them on README.md as completed

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mentioned in commit 93efb2ce

closed with merge request !2 (merged)