I have created a README.md file in my username.github.io repository but it doesn't appear on my profile page:

Profile READMEs must be located in a public repository named after your GitHub user name. This is different from your GitHub Pages User site.
Assuming your GitHub username is username:
Your GitHub Pages User Site should be in a repository named username.github.io. You already have one of these.
The repository for your profile README.md should just be named username. Create a new repository with that name and add your README.md there.
You just have to create a new repository with the name as your username (ProgrammerGaurav) and create a README.md in that repository.
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