Autosave in level editor

[faucomte97]

Summary
We would like to add an autosave feature in to Rapid Router

User story
_As a user
_I would like to understand that my progress has been saved
_so that I don't lose work or get anxious that it hasn't saved

What pages will be changed?
This will affect the game pages of Rapid Router

Outcome/deliverable
We would like two icons or an animation that represents that the work is being saved (check Material UI for existing patterns) and we would like a mock up of where it will be placed in Rapid Router, so that the user can see it.

Tools
You can use screenshots to create a mock up in your preferred tool.

Concerns
Please use colours in the existing design, and don't use any copyrighted images/animations. Work needs to be original.

Reviewer
@lauracumming

People to contact
@lauracumming

https://dribbble.com/shots/3926517-Description-Editor-Updates

https://dribbble.com/shots/3702581-Save-Saving-Saved

https://dribbble.com/shots/2935962-Autosave-icon

[faucomte97]

@lauracumming Please groom. Linked to ocadotechnology/rapid-router#1639