Add Typescript example to "Securing your webhooks"

[tycrimm]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/webhooks-and-events/webhooks/securing-your-webhooks

What part(s) of the article would you like to see updated?

It would be great to add a Typescript example to make it easier for people to mindlessly implement webhook verification rather than skip it completely.

Additional information

PR coming a few moments after this issue is created

[welcome]

Thanks for opening this issue. A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[cmwilson21]

@tycrimm Thank you for opening an issue and linking it to your PR! ✨

[Nadaa00]

Engineering Scorecard for nedaa could not be generated. Please check the repository name & make sure it is part of github organization

[Nadaa00]

@tycrimm Thank you for opening an issue and linking it to your PR! ✨