Adds CODING_STYLE.md and RELEASE_NOTES files

The files are also added in the Xcode project
Adds RELEASE_NOTES and CODING_SYTLE.md into Xcode
Removes unneeded log

This log is already part of `CCConfiguration`
Updates CHANGELOG with the new misc changes
Merge pull request #3827 from ricardoquesada/adds_missing_files

Adds missing files