docs: create readme

README.md

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-# motion
- 🎨 An elegant motion library for Roblox
+# 🎨 Motion
+
+**Motion** is a simple, lightweight, and easy-to-use Roblox library for creating simple transitions and animations. It is inspired by [roact-spring](https://github.com/chriscerie/roact-spring) and is primarily intended to be a general-use alternative to [Flipper](https://github.com/Reselim/Flipper) for [Roblox-TS](https://roblox-ts.com).
+
+You may use Motion with or without Roact. Currently, there is no package for using Motion with Roact.
+
+## 📦 Installation
+
+Motion is available on [NPM](https://www.npmjs.com/package/@rbxts/motion) and can be installed with the following commands:
+
+```bash
+npm install @rbxts/motion
+yarn add @rbxts/motion
+pnpm add @rbxts/motion
+```
+
+## 📚 Documentation
+
+TODO