Open index.html and include PouchDB in the app by adding a script tag:
index.html
<script src="//cdn.jsdelivr.net/npm/[email protected]/dist/pouchdb.min.js"></script> <script src="js/base.js"></script> <script src="js/app.js"></script>
PouchDB is now installed in your app and ready to use! (In production, you should use a local copy of the script.)