crane/gcrane: add pages (#13853)

pages/common/crane-append.md

@@ -0,0 +1,33 @@
+# crane append
+
+> Push an image based on an (optional) base image.
+> Appends layers containing the contents of the provided tarballs.
+> More information: <https://github.com/google/go-containerregistry/blob/main/cmd/crane/doc/crane_append.md>.
+
+- Push image based on a base image:
+
+`crane append {{-b|--base}} {{image_name}}`
+
+- Push image with appended layer from tarball:
+
+`crane append {{-f|--new_layer}} {{layer_name1 layer_name2 ...}}`
+
+- Push image with appended layer with new tag:
+
+`crane append {{-t|--new_tag}} {{tag_name}}`
+
+- Push resulting image to new tarball:
+
+`crane append {{-o|--output}} {{path/to/tarball}}`
+
+- Use empty base image of type OCI media instead of Docker:
+
+`crane append --oci-empty-base`
+
+- Annotate resulting image as being based on the base image:
+
+`crane append --set-base-image-annotations`
+
+- Display help:
+
+`crane append {{-h|--help}}`