Add unifi_static_route

Fixes #42

docs/resources/static_route.md

@@ -0,0 +1,60 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "unifi_static_route Resource - terraform-provider-unifi"
+subcategory: ""
+description: |-
+  unifi_static_route manages a static route.
+---
+
+# unifi_static_route (Resource)
+
+`unifi_static_route` manages a static route.
+
+## Example Usage
+
+```terraform
+resource "unifi_static_route" "nexthop" {
+  type     = "nexthop-route"
+  network  = "172.17.0.0/16"
+  name     = "basic nexthop"
+  distance = 1
+  next_hop = "172.16.0.1"
+}
+
+resource "unifi_static_route" "blackhole" {
+  type     = "blackhole"
+  network  = var.blackhole_cidr
+  name     = "blackhole traffice to cidr"
+  distance = 1
+}
+
+resource "unifi_static_route" "interface" {
+  type      = "interface-route"
+  network   = var.wan2_cidr
+  name      = "send traffic over wan2"
+  distance  = 1
+  interface = "WAN2"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- **distance** (Number) The distance of the static route.
+- **name** (String) The name of the static route.
+- **network** (String) The network subnet address.
+- **type** (String) The type of static route. Can be `interface-route`, `nexthop-route`, or `blackhole`.
+
+### Optional
+
+- **interface** (String) The interface of the static route (only valid for `interface-route` type). This can be `WAN1`, `WAN2`, or a network ID.
+- **next_hop** (String) The next hop of the static route (only valid for `nexthop-route` type).
+- **site** (String) The name of the site to associate the static route with.
+
+### Read-Only
+
+- **id** (String) The ID of the static route.
+
+