Fixed typo issue #55

[ananya0504]

Fixes #55

Short description of what this resolves:

Typo error in README.md #55

What Changes proposed in this pull request:

• Changed "git add -a" to "git add ."

Checklist

• Added description of change
• Relevant documentation/comments is changed or added
• Search previous suggestions before making a new one, as yours may be a duplicate.
• I acknowledge that all my contributions will be made under the project's license.

Notes:
Fixed typo error in README.md

[Utkarsh1504]

Thank you for fixing this!