Add a README for falco-nats output

kubernetes-response-engine/falco-nats/README.md

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+# NATS output for Sysdig Falco
+
+As Falco does not support a NATS output natively, we have created this small
+golang utility wich reads Falco alerts from a named pipe and sends them to a
+NATS server.
+
+This utility is designed to being run in a sidecar container in the same
+Pod as Falco.
+
+## Configuration
+
+You have a [complete Kubernetes manifest available](https://github.com/draios/falco/tree/kubernetes-response-engine/deployment/falco-daemonset.yaml) for future reading.
+
+Take a look at sidecar container and to the initContainers directive which
+craetes the shared pipe between containers.
+
+### Container image
+
+You have this adapter available as a container image. Its name is *sysdig/falco-nats*.
+
+### Parameters Reference
+
+* -s: Specifies the NATS server URL where message will be published.  By default
+    is: *nats://nats.nats-io.svc.cluster.local:4222*
+
+* -f: Specifies the named pipe path where Falco publishes its alerts. By default
+    is: */var/run/falco/nats*