Document setting bond options

There was no documentation of the supported bond options.
Added supported options to the README.md and added an example of a
simple bond with both of those options.

examples/bond_simple.yml

@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: BSD-3-Clause
+---
+- hosts: network-test
+  vars:
+    network_connections:
+
+      # Create a bond master
+      - name: bond0
+        state: up
+        type: bond
+        interface_name: bond0
+        # bond configuration settings: (optional)
+        bond:
+          mode: active-backup
+          miimon: 110
+
+      # enslave an ethernet to the bond
+      - name: slave1
+        state: up
+        type: ethernet
+        interface_name: eth1
+        master: bond0
+
+      # enslave a second ethernet to the bond
+      - name: slave2
+        state: up
+        type: ethernet
+        interface_name: eth2
+        master: bond0
+
+  roles:
+    - linux-system-roles.network
+...