App name should not contain upper case chars

[duynguyen]

Generated app by aio app init automatically uses project name on I/O Console as app name in package.json, e.g. LooseScarletSwallow.
This is not compliant with npm convention [1], quoting: "New packages must not have uppercase letters in the name." VSCode complains about the same: String does not match the pattern of "^(?:@[a-z0-9-*~][a-z0-9-*._~]*/)?[a-z0-9-~][a-z0-9-._~]*$".

Of course the users can change this value easily. But the template should also follow the convention.

[1] https://docs.npmjs.com/files/package.json