readme: add kaltura player to players list

[giladna]

This PR will...

add kaltura player to players list in README.md

Why is this Pull Request needed?

Are there any points in the code the reviewer needs to double check?

Checklist

• [ x] changes have been done against master branch, and PR does not conflict
• new unit / functional tests have been added (whenever applicable)
• API or design changes are documented in API.md

[robwalch]

Changes failed the lint check. Please run prettier (npm run prettier) and commit the formatting changes:
https://github.com/video-dev/hls.js/actions/runs/3750531239/jobs/6376269421

[robwalch]

Thanks for fixing the lint warnings. My previous comment was to fix the prettier formatting error in the README file which is still breaking the build.

Checking formatting...
[warn] README.md
[warn] Code style issues found in the above file. Forgot to run Prettier?
Error: Process completed with exit code 1.

npm run prettier will apply the style fixes.