chore(README): add Contributing tags section

README.md

@@ -1,2 +1,18 @@
 # Bun discord bot
-Official serverless [discord](https://bun.sh/discord) bot for [bun](https://bun.sh/) runtime
+Official serverless [discord](https://bun.sh/discord) bot for [bun](https://bun.sh/) runtime
+
+## Contributing tags
+To create a new tag, you need to fork the repository and edit the `tags.toml` file
+
+Format:
+```toml
+[example-tag]
+keywords = ["example", "tag"]
+content = """
+I love bun ❤️
+"""
+```
+
+Informations:
+- The bot uses interactions so you can use emoji from all discord servers. However, please only use ours as we can't control the others.
+- You can use hyperlink `[bun.sh](https://bun.sh)`