Add Docker section to readme

README.md

@@ -7,3 +7,18 @@ DNS resolver in matrix. Just invite `@dnsbot:matrix.org` in your 1:1 or group ch
 - Fully supports encryption
 - Support bot-bridges
 - Async
+
+## Use with Docker
+
+Simple as
+
+```bash
+docker run -d --name dnsbot --restart always \
+  -v db:/db \
+  -e HOMESERVER=https://matrix.org/ \
+  -e USERNAME=dnsbot \
+  -e PASSWORD=p4ssW0rD_ \
+  --dns 1.1.1.1 \
+  --cpus 0.5 -m 100m \
+  cofob/dnsbot
+```