Add SpaceXplorer to the list of known apps

[pavles6]

Hi, I made a SpaceX launch tracker web application under the name: SpaceXplorer.

The app gives you an ability to search for launches and filter them on /search page and inspect every single launch via a dynamic url: /launches/{id}.

Index page also has a countdown for the next upcoming launch.

Source code is available on the GitHub Repo of this project.

App is currently hosted on https://space-xplorer.vercel.app/

Thanks for maintaining this amazing API! 🚀