Add svelte plugin to plugins page (#5827)

docs/plugins.md

@@ -51,6 +51,7 @@ Providing at least one path to `--plugin-search-dir`/`pluginSearchDirs` turns of
 - [`prettier-plugin-pg`](https://github.com/benjie/prettier-plugin-pg) by [**@benjie**](https://github.com/benjie)
 - [`prettier-plugin-ruby`](https://github.com/iamsolankiamit/prettier-ruby) by [**@iamsolankiamit**](https://github.com/iamsolankiamit)
 - [`prettier-plugin-solidity`](https://github.com/prettier-solidity/prettier-plugin-solidity) by [**@mattiaerre**](https://github.com/mattiaerre)
+- [`prettier-plugin-svelte`](https://github.com/UnwrittenFun/prettier-plugin-svelte) by [**@UnwrittenFun**](https://github.com/UnwrittenFun)
 
 ## Developing Plugins