COPYING: Add CC 4.0 by-sa legalcode

The 4.0 CC license:
   - share-alike
   - atribution needed
   - allow derivative work (even commercially)

http://creativecommons.org/licenses/by/4.0/legalcode.txt

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
Signed-off-by: Lucas Dutra Nunes <ldnunes@ossystems.com.br>
RN: Add CC license to footer

Add Creative Commons license to be show in footer.
The CC license:
 - share-alike
 - atribution needed
 - allow derivative work (even commercially)

http://creativecommons.org/licenses/by/4.0/legalcode

Also disable the default "Copyright:" to be shown on footer.

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
Signed-off-by: Lucas Dutra Nunes <ldnunes@ossystems.com.br>
RN: Add freescale_release_name variable

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
RN: Add a complete introduction to the project

Describe what is the motivation, what to expect and
several other important and initial information.

Please, provide any feedback on the text content.

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>