$ npm run start
- https://svg-color.vercel.app/hex/ffd500.svg
- https://svg-color.vercel.app/hex/ffd500.●.svg
- http://localhost:3000/hex/ffd500.svg
- https://svg-color.vercel.app/r/0/g/0/b/0.svg
- https://svg-color.vercel.app/r/0/g/0/b/0.▲.svg
- http://localhost:3000/r/0/g/0/b/0.svg
- https://svg-color.vercel.app/r/0/g/0/b/0/a/0.3.svg
- https://svg-color.vercel.app/r/0/g/0/b/0/a/0.3.■.svg
- http://localhost:3000/r/0/g/0/b/0/a/0.3.svg
- https://svg-color.vercel.app/h/50/s/100/l/50.svg
- https://svg-color.vercel.app/h/50/s/100/l/50.★.svg
- http://localhost:3000/h/50/s/100/l/50.svg
- https://svg-color.vercel.app/h/50/s/100/l/50/a/0.3.svg
- http://localhost:3000/h/50/s/100/l/50/a/0.3.svg
- https://svg-color.vercel.app/c/100/m/0/y/0/k/0.svg
- https://svg-color.vercel.app/c/100/m/0/y/0/k/0.▼.svg
- http://localhost:3000/c/100/m/0/y/0/k/0.svg
- Read the function parseOptions for more details.