Add formula for building Akgregator

Sorry for any mistakes / messiness, I tried to cobble this together best I could.

At the moment, I'm running into an issue with libkleo looking for Gpgmepp. Any help is appreciated. I'm also unsure of the tiers to put them in so they can be updated with the scripts.

Formula added and working:

• kf5-kcalendarcore
• kf5-kcontacts
• kf5-kidentitymanagement
• kf5-kuserfeedback
• kf5-syndication
• kontact-interface
• kpimtexedit
• ksmtp

WIP:

• kf5-libkleo
• akregator