chore: add vscode config file (#411)

Signed-off-by: Ryan Wang <i@ryanc.cc>

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode",
+    "editorconfig.editorconfig",
+    "johnsoncodehk.volar"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,22 @@
+{
+  "eslint.validate": ["javascript", "typescript", "javascriptreact", "vue"],
+  "[vue]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[jsonc]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[javascript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[json]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "[html]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+  },
+  "editor.tabSize": 2
+}