Here find the answer to the below questions:

What is the purpose of a README file?

It is the billboard of the repository, it give some general and technical information about the repo such as:

1. What the repo is about.
2. What problem it solves.
3. How to install and use it.
4. how to contribute.

Basically, all the data a person using the repo should know, can go here.

What is the purpose of a wireframe?

It specifies the structure of a page and how different sections get in place next to each other.

What is a branch in Git?

It is an absolute separate line from the main branch of a project, which can be changed without affecting the main branch.