Created Yggdrasil (markdown)

Yggdrasil.md

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+## Run using the subnet address
+
+> [!TIP]
+> See also `http://[222:a8e4:50cd:55c:788e:b0a5:4e2f:a92c]/yggdrasil:subnet_setting`
+
+Get your subnet address for the current Yggdrasil instance:
+
+``` bash
+sudo yggdrasilctl getself
+```
+* copy `IPv6 subnet` value e.g. `300:xxxx:xxxx:xxxx::`
+
+Create address using free `0200::/7` range, e.g. `300:xxxx:xxxx:xxxx::1`
+
+Add new address into `yggdrasil.service`:
+
+``` /etc/systemd/system/yggdrasil.service
+[Service]
+ExecStartPost=/bin/sleep 5s
+ExecStartPost=/bin/ip address add 300:xxxx:xxxx:xxxx::1/64 dev tun0
+```
+* to get current `systemd` service location, just run `systemctl status yggdrasil`
+* apply the changes:
+    * `sudo systemctl daemon-reload`
+    * `sudo systemctl restart yggdrasil`
+* check the new address is connected with `ifconfig`
+
+### Firewall
+
+By using `iptables` with `ufw`, add following permission for port `1900`:
+
+``` bash
+sudo ufw allow from 0200::/7 to 300:xxxx:xxxx:xxxx::1 port 1900 proto tcp
+```
+* check the rules was updated successfully: `ufw status`
+
+### Launch
+
+Run the server from `nexy` user:
+
+```bash
+nexy --public /path/to/dir --bind [300:xxxx:xxxx:xxxx::1]:1900
+```
+* replace `/path/to/dir` with your files location
+* open `nex://[300:xxxx:xxxx:xxxx::1]` in your browser