Update readme.md

readme.md

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 |**Travis CI**|  [![Build Status](https://travis-ci.org/Rair-Project/rair-core.svg?branch=master)](https://travis-ci.org/Rair-Project/rair-core)|
 |**Code Coverage**|[![codecov](https://codecov.io/gh/Rair-Project/rair-core/branch/master/graph/badge.svg)](https://codecov.io/gh/Rair-Project/rair-core)|
 |**API**| [![API](https://img.shields.io/badge/api-master-purple.svg)](https://rair-project.github.io/rair-core/)|
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+Rair is a work in progress rewrite of radare2 in rust with these goals:
+- Native speed.
+- Extremely flexible and modern analysis.
+- Simpler building system.
+- Worry less about undefined behavior.
+- Smooth translation to multithreading.
+- Extremely stable and well documented API.
+- Focusing on correctiness more than focusing on features.
+- Avoid legacy systems compatiability.