Added IDT, a largest telecommunications company

[qaforeveryone]

Added IDT corp, a large telecommunications company (https://en.wikipedia.org/wiki/IDT_Corporation)

[abhivaikar]

Hi @qaforeveryone thanks for this PR. Unfortunately I won't be able to include this into howtheytest because the resources proposed come across as promotional material for testrigor as a platform. Moreover the articles just talk about percentage improvements of test automation coverage without really talking anything about how the transformation was achieved with TestRigor - which is more useful for the community to learn from rather than just "We adopted testrigor and went from 0 to 91% test automation".

Hope you understand.