Instruct VSCode to indent using spaces, also ignore two temp files created by VSCode.

.vscode/settings.json

@@ -1,5 +1,7 @@
 // Place your settings in this file to overwrite default and user settings.
 {
+    // Unofficially, QMK uses spaces for indentation
+    "editor.insertSpaces": true,
     // Configure glob patterns for excluding files and folders.
     "files.exclude": {
         "**/.build": true,