Add readme.

Author: jcs090218

README.md

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+[![Build Status](https://travis-ci.com/jcs090218/UnityLua.svg?branch=master)](https://travis-ci.com/jcs090218/UnityLua)
+[![Unity Engine](https://img.shields.io/badge/Unity%20Engine-2019.3.3f1-blue.svg)](https://unity3d.com/get-unity/download/archive)
+[![Release Tag](https://img.shields.io/github/tag/jcs090218/UnityLua.svg?label=release)](https://github.com/jcs090218/UnityLua/releases/latest)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
+# Unity Lua
+> Use Lua scripting lanaguage in Unity to accomplish hot update/fox functionalitiy.
+
+Project built on top of the [tolua](https://github.com/topameng/tolua) by [topameng](https://github.com/topameng).