Add basic README.md with an example

README.md

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+# slim
+
+Turning containers into bootable VMs
+
+## Example - Minimal Alpine Busybox
+
+```sh
+# Build the container
+podman build ./example/alpine -t slim-alpine
+
+# Make the container bootable by extracing initrd and vmlinuz (initial ramdisk and kernel)
+slim build slim-alpine
+
+# Boot the image using QEMU, `./example/alpine/init` will drop you into an interactive shell.
+slim run slim-alpine
+```