add to dnsimple addon catalogue

[OleMchls]

• OAuth application client_id
  f95341a4a374e090
• Add-on name
  E-Mail Reports
• Add-on summary
  Get your personal DNSimple E-mail reports!
• Add-on explanation
  This add-on sends you a detailed status Reports about your DNSimple account. Including your Domains, certificates and all items that expire within the next 30 days.
• Add-on icon
  
• Add-on cover

- [x] ~~Add-on screenshots~~ there are not more screens to show

[OleMchls]

All details added. Your turn @jacegu :)

[jacegu]

Thanks @Nesquick!

Add-on added to the catalog.

Pictures will be uploaded somewhere else and served from there instead of copying the URL that GitHub provides. @sbastn will do this so I'm tasking him with closing this issue 😁

[sbastn]

Updated email icon and screenshots. Closing!