Added the Markdown Syntax Cheat Sheet article

Signed-off-by: Byron Sanchez <bfs5030@gmail.com>
Added the Mobile Application Development Workflow overview article

Signed-off-by: Byron Sanchez <bfs5030@gmail.com>
Added the AppDev Workflow: Brainstorming article

Signed-off-by: Byron Sanchez <bfs5030@gmail.com>