template command to generate empty project

[pelikhan]

Drop tsconfig.json to fix intellisense, maybe should be done with --pxt-modules command

[mmoskal]

Let's only do it when generating mkc.config and on init. eg pxt-jacdac has top-level tsconfig.json so you don't want another one in uploader/tools (I think).

As for --pxt-modules by default - have to be careful with --mono-repo? maybe we drop it by default but have an option to disable in mkc.config

[pelikhan]

Added option to "init" command to specify an editor.

https://github.com/microsoft/pxt-mkc/pull/39

[pelikhan]

init also drops a tsconfig.json... but maybe i need to be more careful about there it goes.

[pelikhan]

init command added.