Add South Africa flag to Contributors Country Flags section

[cebo-dlalagroup]

Description

Notes to the reviewers

Checklist

• I had fun going through this tutorial (ノ^o^)ノ and learned on the way ٩(＾◡＾)۶
• There are some things I'd like to improve in this tutorial. I have written them below.
• There were steps where I had errors while following this tutorial. I have written them below.

All Submissions:

• I followed the Readme guidelines

New Features:

• I've added docs for the new feature