Add vitest and test script

Author: idirdev

package.json

@@ -8,7 +8,8 @@
     "build": "tsc",
     "dev": "tsc --watch",
     "lint": "tsc --noEmit",
-    "clean": "rm -rf dist"
+    "clean": "rm -rf dist",
+    "test": "vitest run"
   },
   "keywords": ["crdt", "collaboration", "real-time", "operational-transformation", "typescript"],
   "author": "",
@@ -19,6 +20,7 @@
   "devDependencies": {
     "typescript": "^5.5.4",
     "@types/node": "^22.5.0",
-    "@types/uuid": "^10.0.0"
+    "@types/uuid": "^10.0.0",
+    "vitest": "^2.0.4"
   }
 }