Update desc of game

README.md

@@ -1,6 +1,12 @@
 # game-kaiser-java
 An adaption of the old Kaiser/Sumeria game
 
+## Build status
 [![Github Action master branch status](https://github.com/ottlinger/game-kaiser-java/actions/workflows/maven.yml/badge.svg?branch=master)](https://github.com/ottlinger/game-kaiser-java/actions)
 
 [![codecov.io](https://codecov.io/github/ottlinger/game-kaiser-java/coverage.svg?branch=master)](https://codecov.io/github/ottlinger/game-kaiser-java?branch=master)
+
+## Introduction
+
+The game basically starts with a fixed population and land size.
+Each round generates a hravest and you will be prompted to sell/buy/transform the harvest and the next round is about to begin.