Usage of /questions/{id}/flags/add POST
Discussion
Casts a flag (including "close votes") against the question identified by id.
The available flag_options on a question are not constant, and must be fetched from /questions/{id}/flag/options.
Use an access_token with write_access to create a flag.
Note that the addition of is_retraction 2.3 to flag_options means that POSTing an existing Flag Id through flag_option.id when is_retraction is true will retract the flag instead of returning an error (as had happened in previous versions).
This method returns the question being flagged.
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