Welcome Developer

Issues should be filed at https://github.com/WengerK/vscode-highlight-bad-chars/issues
Pull requests can be made against https://github.com/WengerK/vscode-highlight-bad-chars/pulls

What's in the folder

package.json - this is the manifest file in which you declare the extension and command.
src/extension.ts - this is the main file.

Get up and running straight away

press F5 to open a new window with the extension loaded
set breakpoints in the code inside src/extension.ts to debug the extension
find output from the extension in the debug console

Make changes

you can relaunch the extension from the debug toolbar after changing code in src/extension.ts.
you can also reload (Ctrl+R or Cmd+R on Mac) the VS Code window with the extension to load the changes.

Publish

Push every commits on the master branch of GitHub.
Bump the versions into the CHANGELOG.md & the VERSION.md.
Publish on the Marketplace using the vsce publish command.