Update README with some usage

README.md

@@ -1,2 +1,22 @@
 # Looper
-Experimenting with a simple container.
+Experimenting with a simple container that prints counter to standard output.
+
+## Usage
+Supported platforms:
+* `linux/amd64`
+* `linux/arm64`
+
+Run image:
+```bash
+podman run -d ghcr.io/resilem/looper:latest
+```
+
+Get container id/name:
+```bash
+podman ps
+```
+
+Check counter:
+```bash
+podman logs -f NAME_OF_CONTAINER_HERE
+```