Add doc for "same-pod" example

examples/same-pod/README.md

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+# Make it possible to bind several containers in one pod
+
+In this example, we need to make nginx and php-fpm to run inside the same "pod". The reason is that we configured FPM to listen an unix socket instead of the 9000 port.
+
+Because NGinx will need to connect to the unix socket wich is a file, both containers should share the same node and work together.
+
+So, in the docker-compose file, we need to declare:
+- `katenary.io/empty-dirs: socket` where `socket` is the "volume name", this will avoid the creation of a PVC
+- `katenary.io/same-pod: http` in `php` container to declare that this will be added in the `containers` section of the `http` deployment
+
+You can note that we also use `configmap-volumes` to declare our configuration as `configMap`.
+
+Take a look on [chart/same-pod](chart/same-pod) directory to see the result of the `katenary convert` command.