Support for mocha.el

[UtaAmb]

Could you please add support for mocha.el

[arcticicestudio]

Hi @AntonOrlovAmbulnz :wave:, thanks for your contribution :+1:

It looks like the package is currently unmaintained so I don't know if adding support for it is good for the long term. Maybe we need to evaluate if there are other maintained packages (e.g. a one that support multiple test runners) to add support for it to Nord.