Add footprint in readme

[flip111]

Could the expected code usage and RAM usage be listed in the readme ?

[ryankurte]

If you'd like to measure it, that'd be a neat addition!

It has however been a long time since I have worked on this, you may be better to look at Little VGL which has many more features.

[flip111]

Thanks, i was already looking at that one too. I was trying to compare.