Modified README.md to format it.
Add collaboration_patter.txt file to guide how a team collaborate.
Add github Markdown Basics link int file README.md
Format README.md with # markdown symbol
Rename hell_github.py to hello_github.py
Change README.md to resolve the conflict.
Merge branch 'master' of https://github.com/GuanglinDu/hello_github

Conflicts:
	README.md
Add file module_demo.py to show how to use module in Python.