Adds docs.

docs/manual-setup.md

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+# Manual Setup of Wild Cloud Central
+
+If you want to set up from source (not using the debian package).
+
+```bash
+# Prerequisites
+sudo apt update
+sudo apt install dnsmasq
+
+# Disable systemd-resolved
+sudo systemctl disable systemd-resolved
+sudo systemctl stop systemd-resolved
+
+# Enable dnsmasq
+sudo systemctl enable dnsmasq
+sudo systemctl start dnsmasq
+```