GitLab

* End user oriented README.md and dedicated BUILD.md

* Fixing extension description and marking extension as technology preview in package.json.

* Use VS Code instead of VSCode

* User projects are build with netbeans.jdkhome specified JDK

* Updating titles

* Using * instead of 1 as a hyperlink label

* Update README.md

VSNetBeans -> Apache NetBeans Language Server
Co-authored-by: Dusan Balek <dusan.balek@oracle.com>