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### By submitting this pull request I confirm I've read and complied with the below requirements 🖖

## Requirements for your pull request
- The certificate/course you want to add has to be provided for free and not a trial membership or time-based offer.
- This pull request should have the name of the course(s)/certificate(s) in the format `Add Name of Course(s)/Certificate(s)`.
	- ✅ `Add Java Introduction`
	- ❌ `Update readme.md`
- Your entry should be added at the bottom of the appropriate category.
- Not a duplicate. Please search for existing submissions.
- Make sure the course link is working.
- Has consistent formatting and proper spelling/grammar.
	- Consistent and correct naming. For example, `Node.js`, not `NodeJS` or `node.js`.
- To verify that you've read all the guidelines, please comment on your pull request with just the word `unicorn`.
