Document community client for JavaScript

Added information about an open source community client for JavaScript.

Author: ziv

docs/api/stream_api/index.mdx

@@ -137,6 +137,8 @@ curl --header "Accept:text/event-stream" --get --url "https://sourcegraph.com/.a
 
 If you don't want to write your own client, you can also use Sourcegraph's [src-cli](https://sourcegraph.com/github.com/sourcegraph/src-cli).
 
+An open source community client for JavaScript (for Node.JS, browser, Deno etc.) is available at [source-graph-stream-client](https://github.com/ziv/source-graph-stream-client/tree/main).
+
 ```bash
 src search -stream "secret count:all"
 ```