awesome-certificates/pull_request.md

<!-- Congrats on contributing to awesome-certificates ! 🎉 -->

### 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 courses/certificates in the format `Add Name of Course(s)/Certificate(s)`.
	- ✅ `Add Java Introduction`
	- ❌ `Update readme.md`
- Your entry here should follow the existing Markdown table format. The first character should be uppercase and all coloums should be filled out. 
- Your entry should be added at the bottom of the appropriate category.
- Not a duplicate. Please search for existing submissions.
- Include the link to digital badge/certificate when possible.
- 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`.