add restic integration for doing pod volume backups/restores

Signed-off-by: Steve Kriss <steve@heptio.com>

docs/cli-reference/ark_restic.md

@@ -0,0 +1,34 @@
+## ark restic
+
+Work with restic repositories
+
+### Synopsis
+
+
+Work with restic repositories
+
+### Options
+
+```
+  -h, --help   help for restic
+```
+
+### Options inherited from parent commands
+
+```
+      --alsologtostderr                  log to standard error as well as files
+      --kubeconfig string                Path to the kubeconfig file to use to talk to the Kubernetes apiserver. If unset, try the environment variable KUBECONFIG, as well as in-cluster configuration
+      --kubecontext string               The context to use to talk to the Kubernetes apiserver. If unset defaults to whatever your current-context is (kubectl config current-context)
+      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
+      --log_dir string                   If non-empty, write log files in this directory
+      --logtostderr                      log to standard error instead of files
+  -n, --namespace string                 The namespace in which Ark should operate (default "heptio-ark")
+      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
+  -v, --v Level                          log level for V logs
+      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
+```
+
+### SEE ALSO
+* [ark](ark.md)	 - Back up and restore Kubernetes cluster resources.
+* [ark restic init-repository](ark_restic_init-repository.md)	 - create an encryption key for a restic repository
+