Add in docs for NATS

nats/README-short.txt

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+NATS is an open-source, high-performance, cloud native messaging system.

nats/content.md

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+[NATS](https://nats.io): A high-performance cloud native messaging system.
+==========================================================================
+
+%%LOGO%%
+
+`nats` is a high performance server for the NATS Messaging System.
+
+Example usage
+=============
+
+```bash
+# Run a NATS server
+# Each server exposes multiple ports
+# 4222 is for clients.
+# 8222 is an HTTP management port for information reporting.
+# 6222 is a routing port for clustering.
+# use -p or -P as needed.
+
+$ docker run -d --name nats-main nats
+[1] 2015/08/08 02:18:59.240582 [INF] Starting gnatsd version 0.6.4
+[1] 2015/08/08 02:18:59.240694 [INF] Starting http monitor on port 8222
+[1] 2015/08/08 02:18:59.240708 [INF] Listening for route connections on 0.0.0.0:6222
+[1] 2015/08/08 02:18:59.240801 [INF] Listening for client connections on 0.0.0.0:4222
+[1] 2015/08/08 02:18:59.240823 [INF] gnatsd is ready
+
+...
+
+# To run a second server and cluster them together..
+$ docker run -d --name=nats-2 --link nats-main nats --routes=nats-route://ruser:T0pS3cr3t@nats-main:6222
+
+# If you want to verify the routes are connected, try
+$ docker run -d --name=nats-2 --link nats-main nats --routes=nats-route://ruser:T0pS3cr3t@nats-main:6222 -DV
+[1] 2015/08/08 06:06:18.662453 [INF] Starting gnatsd version 0.6.4
+[1] 2015/08/08 06:06:18.662524 [INF] Starting http monitor on port 8222
+[1] 2015/08/08 06:06:18.662680 [INF] Listening for route connections on :6222
+[1] 2015/08/08 06:06:18.662807 [INF] Listening for client connections on 0.0.0.0:4222
+[1] 2015/08/08 06:06:18.662831 [INF] gnatsd is ready
+[1] 2015/08/08 06:06:18.662862 [DBG] Trying to connect to route on nats-main:6222
+[1] 2015/08/08 06:06:18.663579 [DBG] 172.17.0.52:6222 - rid:1 - Route connection created
+[1] 2015/08/08 06:06:18.663647 [DBG] 172.17.0.52:6222 - rid:1 - Route connect msg sent
+[1] 2015/08/08 06:06:18.664040 [DBG] 172.17.0.52:6222 - rid:1 - Registering remote route "ee35d227433a738c729f9422a59667bb"
+[1] 2015/08/08 06:06:18.664133 [DBG] 172.17.0.52:6222 - rid:1 - Route sent local subscriptions
+```
+
+The server will load the configuration file below. Any command line flags can override these values.
+
+Default Configuration File
+--------------------------
+
+```conf
+# Client port of 4222 on all interfaces
+port: 4222
+
+# HTTP monitoring port
+monitor_port: 8222
+
+# This is for clustering multiple servers together.
+cluster {
+
+  # Route connections to be received on any interface on port 6222
+  port: 6222
+
+  # Routes are protected, so need to use them with --routes flag
+  # e.g. --routes=nats-route://ruser:T0pS3cr3t@otherdockerhost:6222
+  authorization {
+    user: ruser
+    password: T0pS3cr3t
+    timeout: 0.75
+  }
+
+  # Routes are actively solicited and connected to from this server.
+  # This Docker image has none by default, but you can pass a
+  # flag to the gnatsd docker image to create one to an existing server.
+  routes = []
+}
+```
+
+Commandline Options
+-------------------
+
+```bash
+Server Options:
+    -a, --addr HOST                  Bind to HOST address (default: 0.0.0.0)
+    -p, --port PORT                  Use PORT for clients (default: 4222)
+    -P, --pid FILE                   File to store PID
+    -m, --http_port PORT             Use HTTP PORT for monitoring
+    -c, --config FILE                Configuration File
+
+Logging Options:
+    -l, --log FILE                   File to redirect log output
+    -T, --logtime                    Timestamp log entries (default: true)
+    -s, --syslog                     Enable syslog as log method.
+    -r, --remote_syslog              Syslog server addr (udp://localhost:514).
+    -D, --debug                      Enable debugging output
+    -V, --trace                      Trace the raw protocol
+    -DV                              Debug and Trace
+
+Authorization Options:
+        --user user                  User required for connections
+        --pass password              Password required for connections
+
+Cluster Options:
+        --routes [rurl-1, rurl-2]    Routes to solicit and connect
+
+Common Options:
+    -h, --help                       Show this message
+    -v, --version                    Show version
+```

nats/license.md

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+View [license information](https://github.com/nats-io/gnatsd/blob/master/LICENSE) for the software contained in this image.