Chrome Extension Publishing Guide
Download Extension Source Code
Download
unzip the folder, open manifest.json file and change following parameters:
"name"
"description"
"icons"
zip all code into a folder again
you need google chrome web store developer account.
https://chrome.google.com/webstore/devconsole/register
add an app, upload the code zip folder and add needed app description.
if need help with description and screenshots, check existing pubished extension:
https://chrome.google.com/webstore/detail/video-import-app/phfgnkcpfefnfodcmmadboohcfpgpiea
submit your extension for review.