Add license and readme

LICENSE

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+MIT License
+
+Copyright (c) 2019 Dickson Law
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# GMLinear v2.0.0
+
+Matrix and vector library for GameMaker Studio 2.x
+
+## Introduction
+
+GMLinear is an implementation of matrix and vector operations in pure GML. You can use it to simplify many common calculations in 2D and 3D geometry and implement algorithms/formulas involving linear algebra. Hard-coded optimized functions are available for 2D, 3D and 4D vectors and 2x2, 3x3 and 4x4 matrices.
+
+## Requirements
+
+- GameMaker Studio 2.2.2 or above
+
+If you use GameMaker Studio 1.4, please see [GMLinear Legacy](https://github.com/dicksonlaw583/gmlinear-legacy).
+
+## Installation
+
+Download the latest version from [the YoYo Marketplace](http://marketplace.yoyogames.com/assets/8170/gmlinear).
+
+## Contributing to GMLinear
+
+- Clone this repository.
+- Open the project in GameMaker Studio and make your additions/changes to the `GMLinear` extension. Also add corresponding tests to the `GMLinear_test` script group.
+- Use F5 to run the test suite. A successful run should exit on its own without showing any errors (native platforms) or show a green background (HTML5-based platforms).
+- Open a pull request [here](https://github.com/dicksonlaw583/gmlinear2/issues).