Document the plugins

Adds a .md file to the Documentation/ folder for each plugin.

Fixes #16

macvlan.md

@@ -0,0 +1,34 @@
+# macvlan plugin
+
+## Overview
+
+[macvlan](http://backreference.org/2014/03/20/some-notes-on-macvlanmacvtap/) functions like a switch that is already connected to the host interface.
+A host interface gets "enslaved" with the virtual interfaces sharing the physical device but having distinct MAC addresses.
+Since each macvlan interface has its own MAC address, it makes it easy to use with exising DHCP servers already present on the network.
+
+## Example configuration
+
+```
+{
+	"name": "mynet",
+	"type": "macvlan",
+	"master": "eth0",
+	"ipam": {
+		"type": "dhcp"
+	}
+}
+```
+
+## Network configuration reference
+
+* `name` (string, required): the name of the network
+* `type` (string, required): "macvlan"
+* `master` (string, required): name of the host interface to enslave
+* `mode` (string, optional): one of "bridge", "private", "vepa", "passthrough". Defaults to "bridge".
+* `mtu` (integer, optional): explicitly set MTU to the specified value. Defaults to the value chosen by the kernel.
+* `ipam` (dictionary, required): IPAM configuration to be used for this network.
+
+## Notes
+
+* If are testing on a laptop, please remember that most wireless cards do not support being enslaved by macvlan.
+* A single master interface can not be enslaved by both `macvlan` and `ipvlan`.