[ADD] Project: New page about visibility and collaboration

[guga-odoo]

task-4946930

[robodoo]

[auva-odoo]

Thank you for your work @guga-odoo ! Since this feature is relatively minor and, as I understand it, part of the standard project settings, I’d suggest adding it to the Project Management page (as a sub-section of Configuraiton) rather than creating a new one. My review comments reflect that approach (e.g. we won't need to repeat how to access the project settings) but let's discuss this if you see it differently!

[auva-odoo]

Suggested change

	In any case, an internal user with no project access rights can still access a task, provided
	that they are given the corresponding URL (and that they are part of the followers if the project
	is private).
	Internal users without access to the project can still access a task if the URL has been shared with them. For private projects, they must also be a follower of the task.

• I'm not sure what you meant by "project access rights" but I would not use the word "access right" unless it is an actual access right (as in: https://www.odoo.com/documentation/master/applications/general/users/access_rights.html) ; feel free to change this suggestion if it is not what you meant.
• I would also clarify what you mean "by private project", I'm not really sure?