Update motr-developer-guide.md
Added link to maestro.  FYI this maestro repo is something for a future newsletter.
@@ -6,7 +6,8 @@ features.
The first document developers should read is: [Motr Client API](/motr/client.h).
It explains basic notations, terminologies, and data structures in CORTX Motr.
-Example motr client applications can be found in our [m0client-sample-apps repo](https://github.com/Seagate/m0client-sample-apps).
+Example motr client applications can be found in our [m0client-sample-apps repo](https://github.com/Seagate/m0client-sample-apps)
+and an alternaive higher-level interface to motr can be found in out [Maestro repo](https://github.com/Seagate/cortx-mio).
Developers are also assumed having a running CORTX Motr system: please refer to
[Cluster Setup](https://github.com/Seagate/Cortx/blob/main/doc/Cluster_Setup.md)
and [Quick Start Guide](/doc/Quick-Start-Guide.rst). For debugging, ADDB can be
