Added and/or updated config files

.vscode/extension.json

@@ -0,0 +1,11 @@
+{
+  "recommendations": [
+    "bmewburn.vscode-intelephense-client",
+    "dbaeumer.vscode-eslint",
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "felixfbecker.php-debug",
+    "glowingblue.composer-package-name",
+    "firefox-devtools.vscode-firefox-debug"
+  ]
+}