Curriculum: Add mention of certification in Security Roles outline & make a slide.

[alodahl]

• [ ] Add a line or 2 of about this certification in our Security Roles Outline based on the following advice. Include a link and a few words about the certification.
• [ ] Add the same advice in a slide here, and be sure to format it like the rest of the slides.

Advice:
One of the security engineers I worked with recommends doing the OSCP certification. He said it gets you the experience you need to get security jobs.

[vsharma20v]

@alodahl ma'am about which certificate, OSCP?

[vsharma20v]

I would like to work on this issue, ma'am.

[vsharma20v]

I have created the PR #741