btn works

renderer.js

@@ -0,0 +1,18 @@
+let startNumber = 0;
+let endNumber = 0;
+let selectedStore = 'faubourg';
+
+window.addEventListener('load', () => {
+    document.getElementById("start_book_btn").addEventListener('click', () => {
+        window.appointment.startBook(startNumber, endNumber, selectedStore)
+    })
+    document.getElementById("store_selector").addEventListener('change', (event) => {
+        selectedStore = event.target.value
+    })
+    document.getElementById("start_number").addEventListener('change', (event) => {
+        startNumber = event.target.value
+    })
+    document.getElementById("end_number").addEventListener('change', (event) => {
+        endNumber = event.target.value
+    })
+})