Add thumb key layout (english)

[shashankbangalore]

Context

No response

Describe your suggested feature

Hi, I was wondering if the thumbkey english layout could be added as a layout option to choose. Thanks!

Other details

No response

Acknowledgements

• [X] I have searched the existing issues and this is a new one, NOT a duplicate or related to another open issue.
• [X] This is a single feature request, in case of multiple feature requests I will open a separate issue for each one (they can always link to each other if related)
• [X] I have written a short but informative title.
• [X] I have checked through the app settings for my feature.
• [X] I will fill out all of the requested information in this form.

[nightkr]

Pull requests for new layouts are welcome. ^^

[nightkr]

Added in 04adc8ea74c945b3cdaa32d1c03d629d8bd90215