add extensions

vscode/extensions.sh

@@ -4,6 +4,11 @@
 pkglist=(
 stuart.unique-window-colors
 dracula-theme.theme-dracula
+ms-vscode.vscode-serial-monitor
+ms-azure-devops.azure-pipelines
+ms-azuretools.vscode-containers
+ms-vscode.hexeditor
+mechatroner.rainbow-csv
 )
 
 for i in ${pkglist[@]}; do