feat(cli): mark dist folder as git ignored file during init command

[OrRosenblatt]

In order to prevent pushing the redundant dist folder created by dcm command into the repository by mistake, this change creates .gitignore file with dist marked as git ignored during the dcm init command.

[EladBezalel]

Can you please add to react as well?

[eladav]

Thanks for the contribution! This is a good improvement. If we have a .gitignore file we might as well add some more defaults (node_modules etc.) I usually use http://gitignore.io/. Search for React Native or Node. If you know a better source for a gitignore file feel free to use it and tell us about it 😃