put a extensions.json into your .vscode dir to trigger the recommendation dialog in vs code, see also https://code.visualstudio.com/docs/editor/extension-gallery#_workspace-recommended-extensions, use "code --list-extensions" to list your currently used extensions

extensions.json

{
  "recommendations": ["adamhartford.vscode-base64","bierner.github-markdown-preview","bierner.markdown-checkbox","chintans98.arkdown-jira","dangmai.workspace-default-settings","DavidAnson.vscode-markdownlint","dbaeumer.vscode-eslint","denco.confluence-markup","DotJoshJohnson.xml","EditorConfig.EditorConfig","emilianox.flow-jira-commit-prefix","esbenp.prettier-vscode","fernandoescolar.vscode-solution-explorer","formulahendry.dotnet-test-explorer","GrapeCity.gc-excelviewer","Gruntfuggly.todo-tree","hbenl.vscode-test-explorer","k--kato.docomment","mhutchie.git-graph","ms-dotnettools.csharp","ms-mssql.mssql","ms-vscode.cpptools","ms-vscode.powershell","ms-vsliveshare.vsliveshare","ms-vsliveshare.vsliveshare-audio","msjsdiag.debugger-for-edge","Orta.vscode-jest","redhat.vscode-yaml","ryu1kn.partial-diff","slevesque.vscode-hexdump","streetsidesoftware.code-spell-checker","streetsidesoftware.code-spell-checker-german","wghats.vscode-nxunit-test-adapter"]
}