chore: add changeset

Author: SkySails

.changeset/strong-meals-grin.md

@@ -0,0 +1,10 @@
+---
+"@navigraph/charts": minor
+---
+
+Added `NavigraphTileLayer`, a Leaflet `TileLayer` that implements Navigraph enroute tiles.
+The aim with this extension is to help developers by making the following features available:
+
+- Switching of source between VFR, IFR and world map
+- Changing of the theme between day and night
+- Automatic handling of credential expiry, with useful hints in the log when something does not look quite right.