Add takumi badge (#358)

Author: ssssota

README.md

@@ -3,6 +3,7 @@
 [![CI](https://github.com/ssssota/svelte-exmarkdown/actions/workflows/ci.yml/badge.svg)](https://github.com/ssssota/svelte-exmarkdown/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/ssssota/svelte-exmarkdown/branch/main/graph/badge.svg?token=5I9YNJ57R3)](https://codecov.io/gh/ssssota/svelte-exmarkdown)
 [![License MIT](https://img.shields.io/npm/l/svelte-exmarkdown)](https://github.com/ssssota/svelte-exmarkdown/blob/main/LICENSE)
+<a href="https://flatt.tech/oss/gmo/trampoline" target="_blank"><img src="https://flatt.tech/assets/images/badges/gmo-oss.svg" height="21px"/></a>
 
 Svelte component to render markdown. Dynamic and Extensible.