Create yggdrasil-only-mode.md

docs/tutorials/yggdrasil-only-mode.md

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+For a router talking to other routers and reseed servers through Yggdrasil only.  
+Start yggdrasil first and make sure you're running from a fresh i2pd installation. Create `~/.i2pd/i2pd.conf`
+
+```
+daemon=true # note: remove it if you running on Windows!
+ipv4=false
+ipv6=false
+ssu=false
+ntcp2.enabled=false
+meshnets.yggdrasil=true  
+```
+
+If you use Yggdrasil subnet and want to bind your router to a particular address specify it with
+`meshnets.yggaddress=` your local yggdrasil address
+
+Start i2pd, it will also reseed from an yggdrasil reseed server. No clearnet communication is involved.