feat(docs): Explain setup

README.md

@@ -1,3 +1,18 @@
 # copy-docker
 
-A small Docker helper script to get images to remote machines
+A small Docker helper script to get images to remote machines
+
+# Setup
+
+Get started like so:
+
+1. Install dependency `pv`
+1. Clone repo into arbitrary path `<repo>`
+1. Make `copy-docker.sh` executable
+    ```
+    chmod +x <repo>/copy-docker.sh
+    ```
+1. Symlink to script, for example
+    ```
+    sudo ln -s <repo>/copy-docker.sh /usr/local/bin/copy-docker
+    ```