Added detailed guide on the internship process to resources

This briefly touches on all of the following: various types of interviews,
practice methods, reaching out to recruiters, more detailed resume advice,
and other resources. I wrote this post to help some people out and have
been giving it to people who've asked me, but I think it could be really
useful for more NYU students to have so I'm making a PR to add this to the
wiki.

docs/Opportunities/Internships/internships.md

@@ -24,6 +24,7 @@ Many of the larger companies will have dedicated internships for freshmen/sophom
 
 You should have an up-to-date resume ready. Your resume should be succinct and at most one page. NYU offers some [tips and templates](https://www.nyu.edu/students/student-information-and-resources/career-development-and-jobs/prepare-for-the-job-search/resumes-and-cover-letters.html) you can take advantage of. Other resources like a LinkedIn profile or GitHub account can also be helpful but are not required for all applications.
 
+* [Getting and Passing Interviews](https://tanzhasan.github.io/Learning/misc/internships/) - An overview of the internship process, including how to get and pass interviews, written by a former NYU student.
 * [Pitt Computer Science Club Wiki](https://github.com/pittcsc/Summer2023-Internships) - The Pitt Computer Science Club has a community-maintained list of internships.
 * [LinkedIn](https://www.linkedin.com/jobs/internships/) - LinkedIn has a list of internships.