📝 Add readme

Author: gluons

README.md

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+# posh-yarn-completion
+[![license](https://img.shields.io/github/license/gluons/posh-yarn-completion.svg?style=flat-square)](./LICENSE)
+[![PowerShell Gallery](https://img.shields.io/powershellgallery/v/yarn-completion.svg?style=flat-square)](https://www.powershellgallery.com/packages/yarn-completion/)
+[![PowerShell Gallery](https://img.shields.io/powershellgallery/dt/yarn-completion.svg?style=flat-square)](https://www.powershellgallery.com/packages/yarn-completion/)
+
+A [Yarn](https://yarnpkg.com/) tab completion for [PowerShell](https://microsoft.com/powershell).
+
+## ⚙️ Installation
+
+Install from [PowerShell Gallery](https://www.powershellgallery.com/)
+
+```powershell
+Install-Module yarn-completion -Scope CurrentUser
+```
+
+---
+
+⚠️ If you haven't allowed script execution policy, set your script execution policy to `RemoteSigned` or `Unrestricted`.
+
+```powershell
+Set-ExecutionPolicy RemoteSigned -Scope CurrentUser
+```
+
+## 🛂 Usage
+
+You have to import the module to use `yarn-completion`.
+
+Add below command into your PowerShell profile.
+
+```powershell
+Import-Module yarn-completion
+```
+
+Then restart your PowerShell.  
+Now you can use tab completion with **Yarn**.
+
+---
+
+⚠️ If you don't have PowerShell profile yet, create it with below command!
+
+```powershell
+New-Item -ItemType File $profile
+```