build: add svelte and tailwind vscode extensions

apply standard svelte typescript prettier rules within svelte files
on paste and save

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+    "recommendations": [
+        "svelte.svelte-vscode",
+        "bradlc.vscode-tailwindcss"
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+      "diffEditor.ignoreTrimWhitespace": false,
+      "editor.formatOnPaste": true,
+      "editor.formatOnSave": true,
+      "svelte.enable-ts-plugin": true
+}