Add documentation for generally available seccomp functionality

Signed-off-by: hasheddan <georgedanielmangum@gmail.com>

content/en/examples/pods/security/seccomp/alpha/default-pod.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: default-pod
+  labels:
+    app: default-pod
+  annotations:
+    seccomp.security.alpha.kubernetes.io/pod: runtime/default
+spec:
+  containers:
+  - name: test-container
+    image: hashicorp/http-echo:0.2.3
+    args:
+    - "-text=just made some syscalls!"
+    securityContext:
+      allowPrivilegeEscalation: false