add prettier for auto formatting (#231)

* [Prettier] Add "prettier"

Makes the formatting of the code consistent.
By using the eslint-plugin-prettier formatting issues will be highlighted as a lint error.
These errors will be auto fixed by running "lint --fix" (which can be done automatically on file save)

* [Prettier] Add "prettier" - Fix formatting

src/util/date.ts

@@ -47,13 +47,10 @@ export const getUploadDateString = (date: Date | number) => {
 
     const addTimeString = wasUploadedToday || wasUploadedYesterday;
     const timeString = addTimeString
-        ? uploadDate.toLocaleTimeString(
-            undefined,
-            {
-                hour: '2-digit',
-                minute: '2-digit',
-            },
-        )
+        ? uploadDate.toLocaleTimeString(undefined, {
+              hour: '2-digit',
+              minute: '2-digit',
+          })
         : '';
 
     if (wasUploadedToday) {