Document the logs plugin

docs/deployment/logs.md

@@ -0,0 +1,38 @@
+# Log Management
+
+```
+logs <app>           # display recent log output
+```
+
+## Usage
+
+### Application Logs
+You can easily get logs of an application using the `logs` command:
+
+```shell
+dokku logs node-js-app
+```
+
+## Behavioral modifiers
+
+Dokku also supports certain command-line arguments that augment the `log` command's behavior.
+
+```
+-n, --num NUM        # the number of lines to display
+-p, --ps PS          # only display logs from the given process
+-t, --tail           # continually stream logs
+-q, --quiet          # display raw logs without colors, time and names
+```
+
+You can use these modifiers as
+
+```shell
+dokku logs <app> <modifiers>
+```
+
+For example,
+
+```shell
+dokku logs node-js-app -t -p web
+```
+will show logs continually from the web process.