Add link to PHP Client (framework agnostic) to docs

Author: CodeWithKyrian

docs/intro.md

@@ -75,6 +75,7 @@ Continue with the full [getting started guide](./getting-started.md).
 | Rust | ➖ | ✅ [from @Anush008](https://crates.io/crates/chromadb) |
 | Elixir | ➖ | ✅ [from @3zcurdia](https://hex.pm/packages/chroma/) |
 | Dart | ➖ | ✅ [from @davidmigloz](https://pub.dev/packages/chromadb) |
+| PHP | ➖ | ✅ [from @CodeWithKyrian](https://github.com/CodeWithKyrian/chromadb-php) |
 | Other?       | ❓    | ❓            |
 
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