A lot more documentation.

docs/add_route_policy.md

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+# `add_route_policy` Command
+
+## Name
+
+`add_route_policy`
+
+## Synopsis
+
+`add_route_policy ${ipv6_prefix} ${fib_number}`
+
+## Description
+
+Configures internal variables to cause `rc.d` scripts to generate pf rules that
+route traffic originating from the specified `${ipv6_prefix}` to be routed
+according to the rules in the specified `fib_number`.
+
+## Examples
+
+#### Send traffic from internal prefix `fd12:3456:789a:bcde::/64` through a friend's network on fib 42
+
+```
+static_routes="${static_routes} my_friend"
+route_my_friend="-6 :: 2001:db8:f000:b000::1 -fib 42" # This specifies a default route for fib 42.
+add_route_policy fd12:3456:789a:bcde::/64 42
+```
+
+## See Also
+
+ - [`add_wireguard_route`](add_wireguard_route.md)
+ - [`add_wireguard_interface`](add_wireguard_interface.md)