Added configurations for main-site linux host and off-site linux host

Added GNS3 example topology image

off-site/scripts/create-bridge

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# This script is for creating a bridge interface, assigning an IP address, and adding physical interface ens1 to it.
+
+# Create bridge
+ip link add type bridge
+# name is non deterministic, fix
+ip address add 200.1.0.4/16 dev bridge0
+
+# Change bridge0 mac address to not conflict with bridge interface of other wireguard peer
+ip link set bridge0 address ee:3b:6b:e2:fc:b2
+
+# Add physical nic to bridge
+ip link set ens1 master bridge0
+ip link set ens1 up
+ip link set bridge0 up
+
+# Static Routes
+# default
+ip route add default via 200.1.0.1
+# to reach l2tp tunnel interface through wg0
+ip route add 200.1.0.3/32 via 192.168.1.1
+# to be able to reach wireguard peer over the internet
+ip route add 200.1.0.2/32 via 200.4.0.1