Added seed yarn script

ref #19

package.json

@@ -63,6 +63,7 @@
   "scripts": {
     "dev": "nodemon src/app.ts",
     "build": "tsc",
-    "docs": "typedoc --out docs src"
+    "docs": "typedoc --out docs src",
+    "seed": "ts-node ./node_modules/typeorm-seeding/dist/cli.js seed"
   }
-}
+}