Use the project name in the meta key field & the amount donated as the meta value, and I would suggest using update_user_meta rather than add_user_meta because reasons. Something like this:
$project="donated_to_" . $project;
update_user_meta( $user_id, $project, $amount );
Apply some sort of logic before setting those variables – you know, in case the user has previously donated to that project.
The function update_user_meta is available on the front end and as for security, use a nonce on the form where you’re collecting this data and check the nonce & user permissions on processing of the form and verify/sanitize the data received from that form during variable assignment.
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