Instructions for running examples

[White-Rabbit-Scientific]

Please add instructions for running the examples.

cargo run --release --features="thin light regular bold fill" --example multiple_variants

[bircni]

This is already fixed in a PR #20

[amPerl]

running an example is part of cargo's documentation. as far as the required features go, it tells you when you try to run it

❯ cargo run --example multiple_variants
error: target `multiple_variants` in package `egui-phosphor` requires the features: `thin`, `light`, `regular`, `bold`, `fill`   
Consider enabling them by passing, e.g., `--features="thin light regular bold fill"`