workflow: use prettier for vscode formatting (#207)

Author: Domino9697

.vscode/settings.json

@@ -1,9 +1,17 @@
 {
+  // Use the project's typescript version
   "typescript.tsdk": "node_modules/typescript/lib",
-  "cSpell.enabledLanguageIds": [
-    "markdown",
-    "plaintext",
-    "text",
-    "yml"
-  ]
+
+  "cSpell.enabledLanguageIds": ["markdown", "plaintext", "text", "yml"],
+
+  // Use prettier to format typescript, javascript and JSON files
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+	"[javascript]": {
+		"editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+	"[json]": {
+		"editor.defaultFormatter": "esbenp.prettier-vscode"
+	},
 }