File uploads in note creator

src/Util.js

@@ -0,0 +1,11 @@
+
+export async function openFile() {
+    return new Promise((resolve, reject) => {
+        let elm = document.createElement("input");
+        elm.type = "file";
+        elm.onchange = (e) => {
+            resolve(e.target.files[0]);
+        };
+        elm.click();
+    });
+}