[Feature request] Add support for client certificate authentication

[fastlorenzo]

Feature suggestion

It would be great to be able to use a client TLS certificate to secure the connection with Kodi via the app.

Context

Typical use case would be when enabling access via internet to avoid having to use a VPN. For example, I use a reverse proxy (nginx) in front of the Kodi web interface, which enforces mutual TLS authentication if the traffic is coming from the internet.

Possible Implementation

An example of implementation could be found in the OpenHab application; the client certificate should be installed on the Android OS and can be selected in the application to be used.

Additional context, screenshots or links

https://en.wikipedia.org/wiki/Mutual_authentication