docs: add repository

Author: imddc

packages/waterfall-vue/package.json

@@ -7,6 +7,10 @@
   "module": "./dist/bundle.js",
   "typings": "./dist/index.d.ts",
   "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/imddc/vue-waterfall"
+  },
   "files": [
     "dist"
   ],