docker-cp: add page (#5468)

pages/common/docker-cp.md

@@ -0,0 +1,16 @@
+# docker cp
+
+> Copy files or directories between host and container filesystems.
+> More information: <https://docs.docker.com/engine/reference/commandline/cp>.
+
+- Copy a file or directory from the host to a container:
+
+`docker cp {{path/to/file_or_directory_on_host}} {{container_name}}:{{path/to/file_or_directory_in_container}}`
+
+- Copy a file or directory from a container to the host:
+
+`docker cp {{container_name}}:{{path/to/file_or_directory_in_container}} {{path/to/file_or_directory_on_host}}`
+
+- Copy a file or directory from the host to a container, following symlinks (copies the symlinked files directly, not the symlinks themselves):
+
+`docker cp --follow-link {{path/to/symlink_on_host}} {{container_name}}:{{path/to/file_or_directory_in_container}}`