Add new templates also from URLs/Gist etc.

[mapoart]

now you can add files from the local file system which is downloaded on demand from Nexss Programmer repositories:

eg. nexss file add myfile.js --template=helloWorld . it will use template from local file system. (or download from repository if not exists).

NEW to implement examples:
nexss file add myfile.js --template='https://nexss.com/templates/myfile.js'
nexss file add myfile.js --template='https://raw.githubusercontent.com/nexssp/cli/master/package.json'