Give examples of create image repository

Signed-off-by: Michael Bridgen <michael@weave.works>

docs/cmd/flux_create_image_repository.md

@@ -11,9 +11,40 @@ An ImageRepository object specifies an image repository to scan.
 flux create image repository <name> [flags]
 ```
 
+### Examples
+
+```
+  # Create an ImageRepository object to scan the alpine image repository:
+  flux create image repository alpine-repo --image alpine --interval 20m
+
+  # Create an image repository that uses an image pull secret (assumed to
+  # have been created already):
+  flux create image repository myapp-repo \
+    --secret-ref image-pull \
+    --image ghcr.io/example.com/myapp --interval 5m
+
+  # Create a TLS secret for a local image registry using a self-signed
+  # host certificate, and use it to scan an image. ca.pem is a file
+  # containing the CA certificate used to sign the host certificate.
+  flux create secret tls local-registry-cert --ca-file ./ca.pem
+  flux create image repository app-repo \
+    --cert-secret-ref local-registry-cert \
+    --image local-registry:5000/app --interval 5m
+
+  # Create a TLS secret with a client certificate and key, and use it
+  # to scan a private image registry.
+  flux create secret tls client-cert \
+    --cert-file client.crt --key-file client.key
+  flux create image repository app-repo \
+    --cert-secret-ref client-cert \
+    --image registry.example.com/private/app --interval 5m
+
+```
+
 ### Options
 
 ```
+      --cert-ref string         the name of a secret to use for TLS certificates
   -h, --help                    help for repository
       --image string            the image repository to scan; e.g., library/alpine
       --scan-timeout duration   a timeout for scanning; this defaults to the interval if not set