chore: add zip command

Author: aminya

package.json

@@ -29,6 +29,7 @@
     "start.browser": "servor ./dist/ --browse --reload",
     "start.benchmark": "node ./benchmark/native-benchmark.mjs",
     "start.node": "node ./dist/node/cli.js",
+    "zip": "zip -9 -j ./dist/minijson-windows-x64.zip ./dist/win32-x64/minijson.exe && zip -9 -j ./dist/minijson-macos-x64.zip ./dist/darwin-x64/minijson && zip -9 -j ./dist/minijson-linux-x64.zip ./dist/linux-x64/minijson",
     "prepublishOnly": "shx rm -rf ./dist/tsconfig.tsbuildinfo ./dist/build.*"
   },
   "devDependencies": {