Install scaffolding for Peggy grammar generator

package.json

@@ -4,8 +4,9 @@
   "description": "The utility which scans Obsidian Tasks and triggers proper notification about them",
   "main": "index.ts",
   "scripts": {
-    "start": "tsx src/index.ts",
-    "build": "tsc && tsc-alias"
+    "grammar": "peggy -c grammar/task.js",
+    "start": "npm run grammar && tsx src/index.ts",
+    "build": "npm run grammar && tsc && tsc-alias"
   },
   "author": "Bartłomiej Pluta <noreply.git@mx.bartlomiejpluta.com>",
   "license": "ISC",
@@ -19,5 +20,6 @@
     "typescript": "^5.6.3"
   },
   "dependencies": {
+    "peggy": "^4.2.0"
   }
 }