Update free-courses-hi.md

[GPGPgauravpunetha12]

What does this PR do?

Add java course

For resources

Description

Why is this valuable (or not)?

easy to learn and start for beginner

How do we know it's really free?

available free on youtube

For book lists, is it a book? For course lists, is it a course? etc.

Checklist:

• [x] Read our contributing guidelines.
• [x] Search for duplicates.
• [x] Include author(s) and platform where appropriate.
• [x] Put lists in alphabetical order, correct spacing.
• [x] Add needed indications (PDF, access notes, under construction).
• [x] Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!