Jupyterlabs LSP virtual documents directory

[atulkumar2]

Reasons for making this change:

General User of Jupyter labs lsp. .virtual_documents folder is created when lsp plugins gets loaded. There is no gitignore for Jupter labs so submmitting here as the next best place.

Links to documentation supporting these rule changes:

https://jupyterlab-lsp.readthedocs.io/en/2.x/Configuring.html#virtual_documents_dir

If this is a new template:

• Link to application or project’s homepage: TODO