add readme

README.md

@@ -0,0 +1,15 @@
+# How to run a a mirror node with a local services code
+
+### Setup
+
+Clone this repository and initialize submodules:
+
+`git submodule update --init --recursive`
+
+### Start hedera-services
+
+`docker-compose -f services/docker-compose.yml -f docker-compose.override-services.yml up -d`
+
+### Start the mirrornode
+
+`docker-compose -f mirror/docker-compose.yml -f docker-compose.override-mirror.yml up -d`