Adding Horovod to Ecosystem page (#93)

Author: brucejlin

_ecosystem/horovod

@@ -0,0 +1,11 @@
+---
+layout: ecosystem_detail
+title: Horovod
+summary: Horovod is a distributed training library for deep learning frameworks. Horovod aims to make distributed DL fast and easy to use.
+external: true
+link: http://horovod.ai
+order: 9
+summary-home: Horovod is a distributed training library for deep learning frameworks. Horovod aims to make distributed DL fast and easy to use.
+featured-home: false
+---
+