note down some stuff in readme

README.md

@@ -0,0 +1,26 @@
+### stalwart
+
+**first setup**
+- server identity
+  - server hostname: m.yaoi.dog
+  - default email domain: yaoi.dog
+  - automatically obtain tls certificate: true
+  - generate email signing keys: true
+- storage
+  - main data storage: sqlite
+  - path: /var/lib/stalwart/mail.sqlite
+- account directory
+  - directory type: use internal
+- logging
+  - log destination: console
+- automatic dns management
+  - dns server type: porkbun
+  - api key
+  - secret key
+  - description: porkbun
+
+**further setup**
+- settings -> security -> allowed ips
+  - added 172.18.0.0/24
+- settings -> network -> http -> security
+  - permissive cors policy: true