Update with instructions

README.md

@@ -1 +1,38 @@
 ### S6-overlay rootfs
+
+The simplest and fastest way to get S6 supervisor in your image
+
+### Usage
+```Docker
+COPY --from=nlss/s6-rootfs:latest ["/", "/"]
+```
+or with fixed version:
+```Docker
+COPY --from=nlss/s6-rootfs:3.1.2.1 ["/", "/"]
+```
+
+That's it!
+
+###### Recommended way to integrate with your image (example)
+```Docker
+# ---------------------
+# Build root filesystem
+# ---------------------
+FROM scratch AS rootfs
+
+# Copy over base files
+COPY ["./rootfs", "/"]
+
+# Install S6
+COPY --from=nlss/s6-rootfs:3.1.2.1 ["/", "/"]
+
+
+# ---------------------
+# Build image
+# ---------------------
+FROM alpine:latest
+
+COPY --from=rootfs ["/", "/"]
+RUN apk add --update --no-cache nano
+```
+