Matching exercise numbers with index number - might be easier to follow?

[akshyeta]

Example:

2.1.2 Issues - keeping track of tasks
In the previous example we have learnt how to create a repository and a file. One feature that is very useful in GitHub to help in the project management of your code are issues. Issues are created to suggest an idea, improvements or keep track of bugs, in other words, it can be viewed as a task list for the project. Issues are very useful especially when working collaboratively. They are very simple to use and are often ways to have a discussion between collaborators on a particular issue.

Exercise 3: Creating an issue