add README

Author: jrainlau

README.md

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+![Scion Logo](./logo.png)
+
+# SCION
+A light tool to generate projects in an easy way.
+
+# Installation
+```
+npm install scion-cli -g
+```
+or
+```
+git clone https://github.com/jrainlau/scion.git
+
+cd scion && npm install
+
+npm link
+```
+
+# Usage
+Open your terminal and type `scion` or `scion -h` , you'll see the help infomation below:
+```
+  Usage: scion <command>
+
+
+  Commands:
+
+    add|a      Add a new template
+    list|l     List all the templates
+    init|i     Generate a new project
+    delete|d   Delete a template
+
+  Options:
+
+    -h, --help     output usage information
+    -V, --version  output the version number
+```
+
+> Note that if you are using `MacOS`, `sudo` was required while using commands `add` and `delete`.
+
+# Commands
+### add | a
+This command would help you to add a new template to the `templates.json`, which will be used by `Scion` to generate projects.
+```
+$ scion add
+
+? Set the custom name of the template: my-first-template
+? Owner/name of the template: jrainlau/scion
+? Branch of the template: new
+┌───────────────────┬────────────────┬────────┐
+│ Template Name     │ Owner/Name     │ Branch │
+├───────────────────┼────────────────┼────────┤
+│ my-first-template │ jrainlau/scion │ new    │
+└───────────────────┴────────────────┴────────┘
+✔ New template has been added successfully!
+```
+`Scion` use [download-git-repo](https://github.com/flipxfx/download-git-repo) to down load git repos. After answering 3 questions, you'll add a new template to `Scion`.
+
+### list | l
+It shows you the templates list.
+```
+$ scion list
+
+┌────────────────────┬────────────────┬────────┐
+│ Template Name      │ Owner/Name     │ Branch │
+├────────────────────┼────────────────┼────────┤
+│ my-first-template  │ jrainlau/scion │ new    │
+├────────────────────┼────────────────┼────────┤
+│ my-second-template │ jrainlau/motto │ master │
+└────────────────────┴────────────────┴────────┘
+```
+
+### init | i
+After adding new templates, you could use this command to generate your own project by choosing template.
+```
+$ scion init
+
+? Template name: my-first-template
+? Project name: my-project
+? Where to init the project? ../
+⠹ Downloading template...
+
+New project has been initialized successfully!
+```
+
+It's easy, right?
+
+### delete | d
+To delete a template, you could use this command:
+```
+$ scion delete
+
+? Which template you want to delete? my-second-template
+┌───────────────────┬────────────────┬────────┐
+│ Template Name     │ Owner/Name     │ Branch │
+├───────────────────┼────────────────┼────────┤
+│ my-first-template │ jrainlau/scion │ new    │
+└───────────────────┴────────────────┴────────┘
+✔ Template has been deleted successfully
+```
+
+# Template
+The most important part of Scion is `template`. All templates' infomation were list in the `templates.json`.
+A template means a project sample, which has a simple or complex file structure.
+
+You can create your own templates repository, and push your templates in different branches. All you need to do then is to add the templates into Scion's `templates.json`.
+
+# License
+MIT.
+
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