k8s: Add documentation on runtime dependencies

Issue-ID: SECCOM-235
Change-Id: I370636220151a5755f467055418f866afe11d5d9
Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>
diff --git a/test/security/k8s/README b/test/security/k8s/README
index e7ee79f..f69eb6e 100644
--- a/test/security/k8s/README
+++ b/test/security/k8s/README
@@ -11,11 +11,23 @@
 Prerequisites
 =============
 
+Build
+-----
+
 - make
 - go_
 
 .. _go: https://golang.org/doc/install
 
+Run
+---
+
+- `Rancher CLI`_
+- Docker_ (required to perform selected Rancher CLI calls)
+
+.. _`Rancher CLI`: https://rancher.com/docs/rancher/v1.6/en/cli
+.. _Docker: https://docs.docker.com/install
+
 Running
 =======