Initial translation for Security Context.

Added the example files.

One small change to fix the broken deployment.

content/id/examples/pods/security/security-context-2.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: security-context-demo-2
+spec:
+  securityContext:
+    runAsUser: 1000
+  containers:
+  - name: sec-ctx-demo-2
+    image: gcr.io/google-samples/node-hello:1.0
+    securityContext:
+      runAsUser: 2000
+      allowPrivilegeEscalation: false