chore: add vscode extension settings (#1477)

for making the VSCode environment stable so that the `format document` will keep the code style as expected.

Author: unional

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+  "recommendations": [
+    "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  }
+}