Added themes

I added the following themes.

https://github-profile-trophy.vercel.app/?username=ryo-ma&theme=flat

https://github-profile-trophy.vercel.app/?username=ryo-ma&theme=onedark

https://github-profile-trophy.vercel.app/?username=ryo-ma&theme=gruvbox

https://github-profile-trophy.vercel.app/?username=ryo-ma&theme=dracula

https://github-profile-trophy.vercel.app/?username=ryo-ma&theme=monokai

Support to the margin between trophies

You can put a margin in the width and height between trophies.
https://github.com/ryo-ma/github-profile-trophy#margin-width

https://github-profile-trophy.vercel.app/?username=ryo-ma&column=3&margin-w=15&margin-h=15

The acquisition condition is secret, but you can know the condition by reading this code.
https://github.com/ryo-ma/github-profile-trophy#secret-rank

Please try this!😁