updated todo list in readme

Author: emilefrey

README.md

@@ -46,4 +46,6 @@ The Material UI Theme can be adjusted in frontend\src\Theme.tsx
 - [x] error context
 - [x] show password errors
 - [x] loading icon on login
-- [ ] forgot password functionality (email)
+- [ ] forgot password functionality (email)
+- [ ] add logo holder
+- [ ] ability to customize background on login