add gps functions

frontend/src/routes/zesty/gps/+page.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+    import { onMount } from "svelte"
+    import { get_coords, is_within_range, type Coordinates } from "$lib/gps"
+
+    let lido_schenna_coords: Coordinates = { latitude: 46.6769043, longitude: 11.1851585 }
+
+    onMount(async () => {
+        let { coords, error } = await get_coords()
+        console.log(coords)
+        if (error != null) {
+            return console.log(error)
+        }
+        if (coords == null) return
+
+        console.log(is_within_range(coords, lido_schenna_coords, 103))
+    })
+</script>