Added readme

README.md

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+# Configuration
+
+```yaml
+network:
+  address: "[::]"
+  port: 9000
+
+websocket:
+  domains:
+    - localhost
+    - smon.example.com
+
+database:
+  host: localhost
+  port: 5432
+  name: smon
+  username: smon
+  password: you_wish
+
+session:
+  daysvalid: 31
+
+application:
+  logfile: /var/log/smon.log
+```