Add donation popup after results are shown

[jfoclpf]

After 10 seconds the results are shown, popup request for donations with text:

This calculator is free, open source, ad free and fully respects your privacy (no name, email, IP nor cookies stored). I already spent more than €5,000 and hundreds of hours in its development and I receive [] therefor.

Please do consider donating 0.1% of what you spend with your car for the calculator that gave you the red-pill for your car costs.