added autocomplete settings with vscode

[HenningScheufler]

adds autocomplete for vscode:

Following assumptions are made that need to be described in the documentation and how to adjust the settings:

• cuda
• gcc

[greole]

You can add the file to https://github.com/exasim-project/NeoFOAM/blob/main/.reuse/dep5 to comply with the spdx header check.