fix publisher name & add github action of testing

[barnuri]

@hsen-dev

• added github action to test that the project pass the build
• add bagets to readme
• fix publisher name

you can also make the github action that run test to be required https://docs.codemagic.io/configuration/github-checks/

and dont forget to make a github secret to make the publish github action work add secert named VSCE_PAT (https://code.visualstudio.com/api/working-with-extensions/publishing-extension#get-a-personal-access-token) https://docs.github.com/en/actions/security-guides/encrypted-secrets

if you need any help you can contact with me :)