SDCORE-669 Updated testpod documentation

Change-Id: I2188e6e5c7546c69c7e21b921f3d4860a418828b
diff --git a/_static/images/TestPod.png b/_static/images/TestPod.png
new file mode 100644
index 0000000..e7d2945
--- /dev/null
+++ b/_static/images/TestPod.png
Binary files differ
diff --git a/developer/testpod.rst b/developer/testpod.rst
index d30a397..2e05039 100644
--- a/developer/testpod.rst
+++ b/developer/testpod.rst
@@ -5,6 +5,9 @@
 TestPod
 ========
 
+.. image:: ../_static/images/TestPod.png
+  :width: 700px
+
 Description
 -----------
 Testpod is developer tool to simulate 5G NFs and control NF behaviour as