[Feature Suggestion] Keyboard shortcuts for FlowCrypt secure compose

[martgil]

Description:

We received user suggestion to have the FlowCrypt browser extension a keyboard shortcuts/keyboard binding similar to Gmail - but for the FlowCrypt secure compose. This includes pressing 'c' for composing email, but in our case it should be for composing secure emails.

Some documentation from Google regarding this can be found at https://support.google.com/mail/answer/6594#zippy=%2Ccompose-chat%2Capplication which can help us identify which keyboard bindings are already set so we can make sure not to overwrite it.

Reference:
https://mail.google.com/mail/u/human@flowcrypt.com/#inbox/FMfcgzGxSHngPZZpNHlSZgCVJFNZccXx