Add Longest Word in Lua

[alexborovets11]

Congrats on taking the first step to contributing to the Sample Programs repository maintained by The Renegade Coder!
For simplicity, please make sure that your pull request includes one and only one contribution.

Please fill one of the sections below as applicable.
Please also add any other relevant information to the Notes section at the bottom.
You may delete or just ignore any other sections.
For more information please refer to our contributing documentation

I Am Adding a New Code Snippet in an Existing Language

• I fixed #your-issue-number-here <--- Please update this with the appropriate issue number
• I did not include any extra folders/libraries
• I named the pull request using Add {PROJECT} in {LANGUAGE} format

[github-actions]

Hey @alexborovets11! Thanks for contributing to this project! We are a rather small team, so it may take some time to process this request. In the meantime, there are several ways you can make yourself a part of The Renegade Coder community. For instance, you can:

• Subscribe to the monthly newsletter
• Become a patron
• Join us on Discord
• And, check out the rest of the list which includes links to The Renegade Coder YouTube channel and Twitter account

Thanks for your help!

[rzuckerm]

Please do not update issue template. All that should be submitted in the PR is the sample program

[rzuckerm]

Also, please log an issue before doing a pull request

[rzuckerm]

I reverted your change to the code snippet template. Please do not modify our templates. Please read the Contributing Guide before making another submission.