Add Peripleo app (#114)

Author: thegsi

README.md

@@ -295,6 +295,7 @@ are designated with a ✅, and hosted projects with a 💙.
 - [Wynd's](https://wynds.com.au/) - Property research website in Australia with flood risk, bushfire risk and school zone maps built with MapLibre JS.
 - [Ace](https://bdlucas1.github.io/ace) - Free on-course golf scorecard app uses OpenStreetMap data to provide course diagrams, distances, and elevations. Runs entirely in the browser on your mobile phone using MapLibre GL JS.
 - [Kurviger](https://kurviger.com/) - Motorcycle Routeplanning and Navigation app for Android and iOS. Uses MapLibre Native, MapLibre Navigation.
+- [Peripleo](https://github.com/britishlibrary/peripleo) - Reusable web map interface with configurable markers, filters, search and more. Open-source and runs on GH pages, all you need is a spreadsheet.
 
 ## Demos / Examples