Add support for IOS

[kacperpaczos]

Checklist

• [X] I have used the search function to see if someone else has already submitted the same feature request.
• [X] I will describe the problem with as much detail as possible.
• [X] This issue only contains a request for one single feature, not multiple (related) features.

App version

16

Problem you are trying to solve

I need K9 on IOS

Suggested solution

Make it on this platform

Screenshots / Drawings / Technical details

No response

[cketti]

There will be a Thunderbird for iOS. Some early information can be found here: https://blog.thunderbird.net/2023/05/thunderbird-is-thriving-our-2022-financial-report/

However, it won't be based on K-9 Mail's code base.