Add Colab Tutorial to Readme

[ProKil]

This PR closes #71, which provides a simple tutorial to illustrate how simple it is to set up sotopia platform with a few clicks.

📑 Description

Adding two links to two google colab notebooks.

✅ Checks

• [x] My pull request adheres to the code style of this project
• [x] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [x] All the tests have passed
• [x] Branch name follows type/descript (e.g. feature/add-llm-agents)
• [x] Ready for code review

ℹ Additional Information