Add Installation Section to README.md

[mstsurnalyakter]

The README.md file for the react-helmet-async package is missing an "Installation" section. This section is crucial for users to quickly understand how to install the package using npm.

Expected Behavior:

• A new "Installation" section should be added to the README.md file.

• The section should include the npm installation command: npm i react-helmet-async

Steps to Reproduce:

1. Navigate to the README.md file in the react-helmet-async repository.

2. Observe that there is no "Installation" section present.

Suggested Solution:

Add the following "Installation" section to the README.md file:

Installation

npm i react-helmet-async

[mstsurnalyakter]

I want to work on this issue. Please assign it to me.