Add docker-compose event

Signed-off-by: Daniel Nephin <dnephin@docker.com>

docs/reference/events.md

@@ -0,0 +1,34 @@
+<!--[metadata]>
++++
+title = "events"
+description = "Receive real time events from containers."
+keywords = ["fig, composition, compose, docker, orchestration, cli, events"]
+[menu.main]
+identifier="events.compose"
+parent = "smn_compose_cli"
++++
+<![end-metadata]-->
+
+# events
+
+```
+Usage: events [options] [SERVICE...]
+
+Options:
+    --json      Output events as a stream of json objects
+```
+
+Stream container events for every container in the project.
+
+With the `--json` flag, a json object will be printed one per line with the
+format:
+
+```
+{
+    "service": "web",
+    "event": "create",
+    "container": "213cf75fc39a",
+    "image": "alpine:edge",
+    "time": "2015-11-20T18:01:03.615550",
+}
+```