New SDK Generator Docs

[#1]

New SDK generator docs have been released.

You can get it from:

1. SDK generator repo: https://bitbucket.sw.nxp.com/projects/MCUCORE/repos/mcu-sdk-generator/browse/doc 

2. Gitbook: http://10.193.108.154:4000/

Here is a snapshot

Getting Started With SDK Generator.md	Getting Starts. It illustrates why we need sdk generator, how to install and use it. Basic concepts and working scenarios are introduced.
Yaml Data Record Guide.md	Illustrate yaml data record rule, syntax, concepts. It covers every aspect of the SDK data.
Yaml Data Record For Project Settings.md	Illustrate yaml data record syntax for project settings.
Yaml Data Record Component Naming Conventions.md	Illustrate SDK component naming conversation.
Yaml Example Reference.md	The reference index for yml/batch set demos.
Release Actions Of SDK Generator.md	Illustrate the release actions of SDK.
SDK Docs Generation Flow.md	Illustrate how to integrate SDK docs generation into sdk generator.
How To Configure Release_config File.md	Illustrate how to config release config yml.
Frequently Asked Questions.md	Frequently asked questions, still on-going, we will add more.