When distributing your add-ons it's important that users recognize the way they are installing the add-ons. Therefore we have created a guideline how to pack your add-ons.
Your .zip archive should contain the following:
|public_html/||Directory of files to upload|
|CREDITS.md (optional)||A plain text file with credits to any other authors of scripts, graphics, etc.|
|LICENSE.md (optional)||A plain text file with a license statement|
|README.md||A plain text file with instructions how to install the add-on|
|UPGRADE.md (optional)||A plain text file with instructions how to upgrade from a previous version|
Here is a README-file Template you may use.