Updated devloper doc to include a install step for first time compilation (apache#423)

Author: liyinan926

resource-managers/kubernetes/README.md

@@ -14,11 +14,14 @@ important matters to keep in mind when developing this feature.
 
 # Building Spark with Kubernetes Support
 
-To build Spark with Kubernetes support, use the `kubernetes` profile when invoking Maven. For example, to simply compile
-the Kubernetes core implementation module along with its dependencies:
+To build Spark with Kubernetes support, use the `kubernetes` profile when invoking Maven. For example, to simply compile the Kubernetes core implementation module along with its dependencies:
 
     build/mvn compile -Pkubernetes -pl resource-managers/kubernetes/core -am -DskipTests
 
+If this is the first time you compile the Kubernetes core implementation module, run the following command to install the dependencies and compile:
+
+    build/mvn install -Pkubernetes -pl resource-managers/kubernetes/core -am -DskipTests
+
 To build a distribution of Spark with Kubernetes support, use the `dev/make-distribution.sh` script, and add the
 `kubernetes` profile as part of the build arguments. Any other build arguments can be specified as one would expect when
 building Spark normally. For example, to build Spark against Hadoop 2.7 and Kubernetes: