Electron version of https://secret-in.me

Don't worry, html and js are not downloaded from the github server every times (as on https://secret-in.me). This time it's fixed in the package.

Note there is not yet support for caching database and you require access to https://api.secret-in.me.

If you want to link to your own api server, you'll have to build electron package yourself (https://github.com/secretin/secretin-app/wiki/How-to-build-electron-package-yourself)