added sample database and database seed "s223856998_sampledata"

[KavinduLiyanage04]

added sample database and database seed "s223856998_sampledata"

changed files:
init-mongo.js

added files:
s223856998_sampledata-seed.json

[newbee1905]

Please remove the changes in the Engine model folder, I assume this is due to running Echo Net

Please use the command git rm --cached <path_here> to remove it from the commit and update your pull request with

git commit --amend --no-edit
git push origin your-pr-branch-name --force-with-lease