chore: Typo Update README.md

[harshpoddar03]

Replaced Principal with Candid, typo in readme

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes # (issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

Checklist:

• [ ] My changes follow the guidelines in CONTRIBUTING.md.
• [ ] The title of this PR complies with Conventional Commits.
• [ ] I have edited the CHANGELOG accordingly.
• [ ] I have made corresponding changes to the documentation.

[sa-github-api]

Dear @harshpoddar03,

In order to potentially merge your code in this open-source repository and therefore proceed with your contribution, we need to have your approval on DFINITY's CLA.

If you decide to agree with it, please visit this issue and read the instructions there. Once you have signed it, re-trigger the workflow on this PR to see if your code can be merged.

— The DFINITY Foundation

[dfx-json]

Hello @harshpoddar03. Thank you for your contribution. Can you please accept the CLA if you'd like this PR to get merged in? Thank you

[dfx-json]

We'll merge this in #947