Add Conference Sponsorship Coordinator Role Documentation.

[AtienoObwanda]

This pull request adds documentation outlining the role responsibilities and requirements for the Conference Sponsorship Coordinator within the Black Python Devs team. The document provides a clear overview of the role's duties, including sponsorship acquisition, relationship management, collaboration, and documentation/reporting tasks. Additionally, it outlines the requirements to fulfill the role and specifies the access granted to the Coordinator.

Changes:

• Added the "Conference Sponsorship Coordinator Responsibilities" document to the roles folder.
• Document includes roles and responsibilities, requirements, and access details.

[activus-d]

Great work @AtienoObwanda! One thing I noticed while briefly checking your PR is that you used your main branch for the PR. To avoid conflicts, it's always advisable to create a new branch for every PR. So what do you think about closing this PR and creating a new one but this time with a newly created branch?

Please read this short article if you need help on how to go about this: https://opensource.com/article/19/7/create-pull-request-github