Add import and export functionality

src/services/adventureService.ts

@@ -18,6 +18,10 @@ export function getNextId() {
     return nextId;
 }
 
+export function setAdventures(importArray: Adventure[]) {
+    adventures = importArray
+}
+
 export function addAdventure(adventure: Adventure) {
     adventures = [...adventures, adventure];
     if (isBrowser) {

src/services/export.ts

@@ -0,0 +1,11 @@
+import type { Adventure } from '$lib/utils/types';
+import { getAdventures } from './adventureService';
+
+export function exportData() {
+    let adventures: Adventure[] = getAdventures()
+    let jsonArray = JSON.stringify(adventures)
+    console.log(jsonArray)
+    let blob = new Blob([jsonArray], {type: "application/json"});
+    let url = URL.createObjectURL(blob);
+    return url
+}

src/services/import.ts

@@ -0,0 +1,12 @@
+import type { Adventure } from '$lib/utils/types';
+import { setAdventures } from './adventureService';
+
+export function importData(file:File) {
+    let reader = new FileReader();
+    reader.onload = function() {
+        let importArray: Adventure[] = JSON.parse(reader.result as string);
+        setAdventures(importArray);
+    }
+    reader.readAsText(file);
+    
+}