Add ASUS router guide

Signed-off-by: Christian König <ckoenig@posteo.de>

docs/routers/asus.md

@@ -0,0 +1,7 @@
+ASUS was so kind to set up a FAQ how to configure their routers together with Pi-hole.
+
+They offer two kinds of setup depending on your router's firmware version. On newer firmware they recommend setting Pi-hole as DNS server for the `WAN` connection and on older versions for `LAN` connections. However, we recommend to setup Pi-hole always as DNS server for your `LAN`! If you do so, Pi-hole's IP is distributed as DNS server via DHCP to your network clients. Each client will directly send their queries to Pi-hole and will be shown individually in Pi-hole's web interface. Additionally, you can use the group management features.
+
+You can find the FAQ here: [https://www.asus.com/support/FAQ/1046062/](https://www.asus.com/support/FAQ/1046062/)
+
+{!abbreviations.md!}

mkdocs.yml

@@ -174,6 +174,7 @@ nav:
   - 'Router setup':
     - 'Fritz!Box (EN)': routers/fritzbox.md
     - 'Fritz!Box (DE)': routers/fritzbox-de.md
+    - 'ASUS router': routers/asus.md
   - 'FAQ': main/faq.md
   - 'Community Projects': main/projects.md