add prettier config

.prettierrc.json

@@ -0,0 +1,14 @@
+{
+  "plugins": ["prettier-plugin-svelte"],
+  "overrides": [
+    {
+      "files": "*",
+      "excludeFiles": ["*.svelte", "*.html", "*.json"],
+      "options": {
+        "tabWidth": 4
+      }
+    },
+    { "files": "*.svelte", "options": { "parser": "svelte" } }
+  ],
+  "trailingComma": "es5"
+}

package.json

@@ -1,13 +1,16 @@
 {
-    "name": "nextgraph-rs",
-    "private": true,
-    "version": "0.1.0",
-    "pnpm": {
-      "peerDependencyRules": {
-        "ignoreMissing": [
-          "rollup"
-        ]
-      }
+  "name": "nextgraph-rs",
+  "private": true,
+  "version": "0.1.0",
+  "pnpm": {
+    "peerDependencyRules": {
+      "ignoreMissing": [
+        "rollup"
+      ]
     }
+  },
+  "devDependencies": {
+    "prettier": "^3.3.2",
+    "prettier-plugin-svelte": "^3.2.5"
   }
-  
+}