added types for vue-electron

[AllanPinheiroDeLima]

Hi, so, as promised a few days ago, I did the types.d.ts. It is a tiny file

This should solve for those who download this package via npm and use the intelisense. I honestly don't know if it is correct way to type the package, but it works in my environment.

Can you take a look too, please ?

:)

[SimulatedGREG]

This doesn't seem to cover all importable items from electron. Could we get it to apply for all, instead of a small set list? Also let's add a types field to the package.json so the TypeScript compiler can easily find this.