feature/app now receives exchange rates from API

src/public/scripts/exchangeRate.js

@@ -0,0 +1,7 @@
+function convert(from) {
+    fetch(`https://api.frankfurter.dev/v1/latest?base=${from}`)
+      .then((resp) => resp.json())
+      .then((data) => {
+        console.log(data);
+    });
+}