Use fetchApiSingleton to fetch data from Participants API

[starboi02]

Issue Description

• In the MainActivity create a method named getParticipantData to use the fetchApiSingleton instance for fetching data from the API https://raw.githubusercontent.com/opencodeiiita/Collaborative-Web/main/data/participants.json.
• Create a toast for the error response.
• Create an ArrayList of the Participant object from the json response.
• Make getParticipantData() return ArrayList<Participant>.

Note

• Before starting work on this issue, update your main branch with the main branch of the main repository.
• Create a new branch from the main working on this issue and give it a meaningful name.
• Note that you must have completed the following issues to claim this issue:
  • Setup the Project on your Local Machine #1
  • Add your name to the list of Contributors (Mandatory) #10
  • Star this Repository #80
• If the above issues have not been completed, this issue will not be assigned to you.