Under Manage Fields section for entities, to mark a field as required we have to go to Edit field settings and then mark it as required.
To simplify it, this module will provide a checkbox (besides the operation column) and mark the field as required on the fly via ajax call without the need to go to the edit page.

Below are the steps, I have envisioned.

1. Extend Drupal\field_ui\FieldConfigListBuilder;