added .vscode

Author: JinIgarashi

Diff for: .vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+  "recommendations": [
+    "dbaeumer.vscode-eslint",
+    "ghmcadams.lintlens",
+    "esbenp.prettier-vscode",
+    "svelte.svelte-vscode",
+    "ardenivanov.svelte-intellisense",
+    "fivethree.vscode-svelte-snippets"
+  ]
+}

Diff for: .vscode/settings.json

@@ -0,0 +1,4 @@
+{
+  "editor.formatOnSave": true,
+  "editor.defaultFormatter": "esbenp.prettier-vscode"
+}