Creating and publishing VSCode extension

Register new account at the marketplace

https://marketplace.visualstudio.com/

Create a new publish and extension name there

Building a new package

Once you've done writing your extension, run

vsce package in your terminal and you'll get vsix file

Then just upload that file on the newly created extension on the marketplace.

Updating the package

Increase the version name in your extension project and then run

vsce package

Then just upload the updated extenion on the marketplace 

Install VSCE extension

npm install -g vsce

If you're having script run is disabled on the system warnings

x64 (64 bit)
Open C:\Windows\system32\cmd.exe
Run the command powershell Set-ExecutionPolicy RemoteSigned