docs: Add a guide for importing users from a csv file

docs/csv_user_import_feature/README.md

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+The .csv user import function lets you populate a Workspace with a large number of users in just one click.
+
+The expected file must be in .csv format, with commas as separators, UTF-8 encoding and CR, LF, CRLF carriage returns.
+
+It must contain two pieces of information per line: “user” and “role”. For users, the login or e-mail address (if unique) can be used. For roles, enter “u” or “user” to add a simple user and “wm” for a Workspace Manager.
+
+Here's a file that you can base upon to fill with the data corresponding to your instance : [users-import.csv](./users-import.csv) .

docs/csv_user_import_feature/users-import.csv

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+user,role
+pierre.quiroul,user
+awang,wm
+radjiv.velasquez,u
+[email protected],wm
+[email protected],user