Write a simple guide on how to run chains in the README.md file

Author: majecty

ibc.ts/README.md

@@ -2,3 +2,20 @@ IBC relayer and scenario
 =========================
 
 This directory contains IBC relayer implementation and IBC demo scenario script.
+
+## Before start
+
+1. Please run `yarn install`. It will install dependencies.
+2. Please run `cp .env.default .env`
+
+## How to run chains
+
+Run `yarn run runChains`
+
+## Print debug log
+
+Please use `DEBUG` environment variable.
+If you want to print all debug log,
+please use "\*" for the `DEBUG` environment variable, like: `DEBUG="*"`
+
+For example you can run like this: `DEBUG="*" yarn run runChains`