Refined README Guide for Freva Plugin Developers

Update the README to closely align with the requirements of Freva Plugin, ensuring it not only thoroughly describes the plugin's purpose and functionality but also remains accessible and comprehensible for future plugin developers.

Adding one installation step before running the cruf to make the plugin template pack

assigned to @k202187

added Priority | Low Sprint Backlog labels

changed title from README need to be completely refactored to Refined README Guide for Freva Plugin Developers

changed the description

mentioned in issue #6 (closed)

changed the description

changed milestone to %Plugin-Template development

closed