Add .gitpod.yml - Githubissues

In order to make contribution easier add .gitpod.yml with VS code extension, including Quarto

Extensions to be added:

codezombiech.gitignore # Language support for .gitignore files
cssho.vscode-svgviewer # SVG viewer
esbenp.prettier-vscode # Markdown/CommonMark linting and style checking for Visual Studio Code
eamodio.gitlens # Quickly glimpse into whom, why, and when a line or code block was changed
EditorConfig.EditorConfig # override user/workspace settings with settings found in .editorconfig files
Gruntfuggly.todo-tree # Display TODO and FIXME in a tree view in the activity bar
mechatroner.rainbow-csv # Highlight columns in csv files in different colors
oderwat.indent-rainbow # Highlight indentation level
streetsidesoftware.code-spell-checker # Spelling checker for source code
quarto.quarto