format markdown with prettier, too

Author: KnorpelSenf

.vscode/settings.json

@@ -3,7 +3,10 @@
     "editor.codeActionsOnSave": {
         "source.fixAll": "explicit"
     },
-    "[typescript]": {
-        "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "[md]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
     },
-}
+    "[typescript]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+    }
+}