docs(os): Explain static systemd network config (#3)

README.md

@@ -89,6 +89,29 @@ After installation you're going to want to at least touch these points in your n
     - ZFS: The password for all datasets underneath `zpool` is `password`.
     - Local `root` account: The local `root` account's password is `password`.
 - Arch User Repository (AUR) helper: We installed [paru](https://github.com/Morganamilo/paru) as our AUR helper, we installed from GitHub via `makepkg -si`.
+- In `/etc/systemd/network/50-wired.network` instead of a DHCP-based network config you can get a static one. The DHCP-based looks for reference looks like:
+    ```
+    ...
+
+    [Network]
+    DHCP=ipv4
+    IPForward=yes
+    Domains=~.
+
+    [DHCP]
+    UseDNS=yes
+    RouteMetric=10
+    ```
+    Dynamic one does away with the `[DHCP]` section:
+    ```
+    ...
+    
+    [Network]
+    Address=10.10.10.2/24
+    Gateway=10.10.10.1
+    DNS=10.10.10.1
+    IPForward=yes
+    ```
 
 # Password change