clarify the need to clone the repo before the build

Author: markxnelson

site/installation.md

@@ -13,9 +13,13 @@ Note that there is a short video demonstration of the installation process avail
 
 ## Build the Docker image for the operator
 
-To run the operator in a Kubernetes cluster, you need to build the Docker image and then deploy it to your cluster.
+To run the operator in a Kubernetes cluster, you need to build the Docker image and then deploy it to your cluster.  The GitHub repository should be cloned locally:
 
-First run the build using this command:
+```
+git clone https://github.com/oracle/weblogic-kubernetes-operator.git
+```
+
+Then run the build using this command:
 
 ```
 mvn clean install
@@ -28,7 +32,7 @@ docker login
 docker build -t weblogic-kubernetes-operator:developer --no-cache=true .
 ```
 
-Note: If you have not used the base image (`store/oracle/serverjre:8`) before you will need to visit the [Docker Store web interface](https://store.docker.com/images/oracle-serverjre-8) and accept the license agreement before Docker Store will give you permission to pull that image. 
+Note: If you have not used the base image (`store/oracle/serverjre:8`) before you will need to visit the [Docker Store web interface](https://store.docker.com/images/oracle-serverjre-8) and accept the license agreement before Docker Store will give you permission to pull that image.
 
 We recommend that you use a tag other than `latest` to make it easy to distinguish your image.  In the example above, the tag could be the GitHub ID of the developer.