feat: add a PR section and add information to the issue section in the contributing guidelines

[adiati98]

Description

This PR adds a PR section and information about taking one good first issue in the contributing guidelines.

Related Tickets & Documents

Closes #193

Mobile & Desktop Screenshots/Recordings

Steps to QA

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [ ] Tier 4

[optional] What gif best describes this PR or how it makes you feel?

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[adiati98]

@BekahHW I need a second pair of eyes here. You need to read it through before approving and merging. So, please take your time on this one. Thanks! 🙂