docs: Add static IP documentation

* Add the documentation while it's fresh.

docs/static-ips.md

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+# Static IP Addresses
+
+The docker image is setup for static client configuration on the 192.168.254.0/24 subnet.  To use it follow the Quick Start section below.  Note that the IP addresses octects need to be picked special, see [OpenVPN Documentation](https://openvpn.net/index.php/open-source/documentation/howto.html#policy) for more details.
+
+## Quick Start
+
+1. Create a client specific configuration:
+
+        $ echo "ifconfig-push 192.168.254.1 192.168.254.2" | docker run --volumes-from openvpn-data -i --rm kylemanna/openvpn tee /etc/openvpn/ccd/CERT_COMMON_NAME
+        ifconfig-push 192.168.254.1 192.168.254.2
+
+2. Wait for client to reconnect if necessary
+
+## Advanced Admin
+
+Login to the openvpn-data volume with a `bash` container, note only changes in /etc/openvpn will persist:
+
+    docker run --volumes-from openvpn-data -it --rm kylemanna/openvpn bash -l
+
+## Upgrading from Old OpenVPN Configurations
+
+If you're running an old configuration and need to upgrade it to pull in the ccd directory run the following:
+
+    docker run  --volumes-from openvpn-data --rm kylemanna/openvpn ovpn_genconfig