Add gradle build files for Recommendations support library

Change-Id: Ic5281e29f5813d3ad0a6f7887d9233a8303b756d
diff --git a/settings.gradle b/settings.gradle
index 6efb120..4c4ac52 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -37,6 +37,9 @@
 include ':support-leanback-v17'
 project(':support-leanback-v17').projectDir = new File(rootDir, 'v17/leanback')
 
+include ':support-recommendation'
+project(':support-recommendation').projectDir = new File(rootDir, 'recommendation')
+
 include ':support-design'
 project(':support-design').projectDir = new File(rootDir, 'design')