(#5) Added postinstall script to initialize e2e test subpackage

Author: s1hofmann

package.json

@@ -46,6 +46,7 @@
   "scripts": {
     "clean": "rm -rf dist",
     "compile": "npm run clean && tsc -p .",
+    "postinstall": "npm --prefix e2e/tests ci",
     "test": "jest --runInBand",
     "test:e2e": "npm --prefix e2e/tests cit",
     "coverage": "jest --coverage --runInBand",