CSOM Script: Created script for termstore hierarchy for all levels

[chandaniprajapati]

Developed a script to establish the term store hierarchy across all levels.

[pkbullock]

Hi @chandaniprajapati - thank you for the great sample! This should be live shortly 🎉😃

I used the PR to make a small tweak to the site ifself to include a reference to the CSOM docs as a one-time action.