feat: add systemd-networkd and systemd-resolved

Applications/System/systemd-networkd.md

@@ -0,0 +1,37 @@
+# [systemd-networkd](https://wiki.archlinux.org/index.php/systemd-networkd)
+
+## Installation
+
+Service: `systemd-networkd.service`
+
+Enable:
+
+```sh
+systemctl enable systemd-networkd.service
+```
+
+Need [systemd-resolved](Applications/System/systemd-resolved.md).
+
+## Configuration
+
+After editing, remember to restart service.
+
+Wired adapter, edit `/etc/systemd/network/20-wired.network`:
+
+```txt
+[Match]
+Name=en*
+
+[Network]
+DHCP=yes
+```
+
+Wireless adapter, edit `/etc/systemd/network/25-wireless.network`:
+
+```txt
+[Match]
+Name=wl*
+
+[Network]
+DHCP=yes
+```

Applications/System/systemd-resolved.md

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+# [systemd-resolved](https://wiki.archlinux.org/index.php/Systemd-resolved)
+
+## Installation
+
+Service: `systemd-resolved.service`
+
+Enable:
+
+```sh
+systemctl enable systemd-networkd.service
+```