README.md: Add hyperlinks

Signed-off-by: Gianpaolo Macario <gianpaolo_macario@mentor.com>
README.md: Remove redundant links for clarity

Signed-off-by: Gianpaolo Macario <gianpaolo_macario@mentor.com>
Add introduction and disclaimer

Signed-off-by: Gianpaolo Macario <gianpaolo_macario@mentor.com>
Add introduction

Signed-off-by: Gianpaolo Macario <gianpaolo_macario@mentor.com>
Merge pull request #57 from gmacario/readme-add-links

README.md: Add links to subprojects