Update README.md

include docker instructions

README.md

@@ -3,5 +3,21 @@
 First trial running a Haroldcoin masternode in a docker container. 
 more info coming soon...
 
+Docker image is available:
+`docker pull dock.atticstudios.be/haroldcoin/masternodes/docker-haroldnode/haroldnode:0.1.0`
+
+Run with a volume bound for the haroldcoin directory, and map port 25676/tcp
+`docker run -d -v {volume|mount}:/root/.haroldcoin -p 25676:25676 --name haroldcoin-mn01 haroldnode:0.1.0`
+The first run will stop the container automatically. A haroldcoin.conf file will have been created in your bound volume. Enter a random 'rpcuser=' and 'rpcpassword=' line. Restart the container
+`docker start haroldcoin-mn01`
+This should start the blockchain download. In the mean time, you can prepare your new masternode transaction! When you update the haroldcoin.conf file in the volume, just restart the container.
+
+09/2023: mount volume size gets around 150mb
+
+Todo:
+- include build in a 2-stage image build
+- run haroldcoin as a restricted user
+- find a lighter base image?
+
 -Gizzmo