Align README file to 100 chars per line

One part of README file exceeded 100 chars. This commit resolves this
problem.
Add information about nfEngine workflow

This commit adds detailed information about workflow in nfEngine:
* Section FORMATTING is updated with basic formatting information
* New sections are created:
    - ISSUE TRACKING
    - WORKFLOW AND BRANCHING IN NFENGINE
    - COMMIT MESSAGE FORMAT
    - PULL REQUEST DESCRIPTION FORMAT
Slightly reformat README file

This commit performs slight reformmating to README file:
* To make separate sections of README more visible, indented each section
  title by 4 spaces.
* Added CONTENTS section to inform user where specific sections are
  located in the document.
Realign README file to 85 chars per line

On GitHub README is displayed with 85 chars per line formatting. This
commit fixes README to be aligned to 85 chars/line, not 100.

Additionally, some minor changes were addressed.
Update Visual Studio entry in DEPENDENCIES section
Convert README to README.md

This commit converts README file to Markdown format. Additionally,
extension is changed to .md, so that GitHub can properly parse the file.
Update README.md
Merge pull request #35 from nfprojects/update_readme

[#30] Update README file