Add a feature of Autocompletion

[manujuniris]

With a click of a Tab, aeweb-cli should predict the rest of a word a user is typing.

[internet-zero]

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[AmodD]

the description of problem statement for this issue needs to have boundary conditions like

• start prediction after x letter in a word
• restrict to certain commands only
• and so on

thus , the title of this issue should also be changed to say " Introducing auto completion feature ..."

and subsequent issues will add enhancements to this issue and we will eventually have the auto-completion feature completed

[ghost]

You don't have much commands only 3/4 so it should take much time.

The detection , word counting can be abstracted using libraries, so just need to take the good one. I think yargs has a feature for this. Just need to explore it a bit more.