Create README.md [ci skip]

Author: yuk7

README.md

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+# CentWSL
+CentOS on WSL (Windows 10 FCU or later)
+based on [wsldl](https://github.com/yuk7/wsldl)
+
+[![Build Status](https://img.shields.io/travis/yuk7/CentWSL.svg?style=flat-square)](https://travis-ci.org/yuk7/CentWSL)
+[![Github All Releases](https://img.shields.io/github/downloads/yuk7/CentWSL/total.svg?style=flat-square)](https://github.com/yuk7/CentWSL/releases/latest)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
+![License](https://img.shields.io/github/license/yuk7/CentWSL.svg?style=flat-square)
+
+### [Download](https://github.com/yuk7/CentWSL/releases/latest)
+
+
+## Requirements
+* Windows 10 Fall Creators Update x64 or later.
+* Windows Subsystem for Linux feature is enabled.
+
+## Install
+#### 1. [Download](https://github.com/yuk7/CentWSL/releases/latest) installer zip
+
+#### 2. Extract all files in zip file to same directory
+
+#### 3.Run CentOS.exe to Extract rootfs and Register to WSL
+Exe filename is using to the instance name to register.
+If you rename it you can register with a diffrent name and have multiple installs.
+
+
+## How-to-Use(for Installed Instance)
+#### exe Usage
+```dos
+Usage :
+    <no args>
+      - Open a new shell with your default settings.
+
+    run <command line>
+      - Run the given command line in that distro. Inherit current directory.
+
+    config [setting [value]]
+      - `--default-user <user>`: Set the default user for this distro to <user>
+      - `--default-uid <uid>`: Set the default user uid for this distro to <uid>
+      - `--append-path <on|off>`: Switch of Append Windows PATH to $PATH
+      - `--mount-drive <on|off>`: Switch of Mount drives
+
+    get [setting]
+      - `--default-uid`: Get the default user uid in this distro
+      - `--append-path`: Get on/off status of Append Windows PATH to $PATH
+      - `--mount-drive`: Get on/off status of Mount drives
+      - `--lxuid`: Get LxUID key for this distro
+
+    backup
+      - Output backup.tar.gz to the current directory using tar command.
+      
+    clean
+      - Uninstall the distro.
+
+    help
+      - Print this usage message.
+```
+
+
+#### How to uninstall instance
+```dos
+>CentOS.exe clean
+
+```