update:add validation functions to validate user input at init.ts script

[sinyo-matu]

Background

In init.ts, I think user input may need some validation to reduce unexpected or confusing behavior.

Move init.ts script contents into src/ may make our code cleaner

What Changed

1. Adding two validation functions: isValidaUrl and isValidDir
2. Moving init.ts script contents input src/intiFile.ts

[sinyo-matu]

@xstevenyung Updated. Please check it out! If I got anything wrong, please correct me. It will be very appreciated.

[sinyo-matu]

@xstevenyung If you got time, please have a check!

[xstevenyung]

thanks a lot @sinyo-matu , amazing work ! 👍