docs(readme): Add install command for yarn

[Ishaan28malik]

What: Added about the yarn installation process.

Why: For developers who run the build using yarn

How: Adding the yarn add bash command.

Checklist:

• Documentation added to the
  docs site
• Tests
• Typescript definitions updated
• Ready to be merged
  

[Ishaan28malik]

@afontcu Please review this.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 4811544:

Sandbox	Source
serene-neumann-4ez10	Configuration
interesting-hofstadter-c9jyi	Configuration

[codecov]

Codecov Report

Merging #645 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #645   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          103       103           
  Branches        15        15           
=========================================
  Hits           103       103           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1232e1f...4811544. Read the comment docs.

[eps1lon]

Thanks for including yarn. Would appreciate it if you could answer the questions below.

[Ishaan28malik]

@eps1lon I have made the required changes

[Ishaan28malik]

Made the final changes.
@eps1lon does this looks good to you?

[Ishaan28malik]

@eps1lon do I still need to make any changes?

[eps1lon]

@all-contributors add @Ishaan28malik for docs

[eps1lon]

@Ishaan28malik Thanks!

[allcontributors]

@eps1lon

I've put up a pull request to add @Ishaan28malik! 🎉

[kentcdodds]

🎉 This PR is included in version 10.0.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[Ishaan28malik]

@kentcdodds that's great to know.