create base documentation (issue #59)

This version introduces multiple enhancements:

added documentation about benchmark usage
some changes in module documentation file
added some images for benchmark documentation

Details of additions/deletions below:
--------------------------------------------------------------

Added:      /docs/image/000000.png
Added:      /docs/image/4d4d4d.png
Added:      /docs/image/006c94.png
Added:      /docs/image/6d6d6d.png
Added:      /docs/image/7e3a02.png
Added:      /docs/image/008e85.png
Added:      /docs/image/213a59.png
Added:      /docs/image/00306a.png
Added:      /docs/image/516e91.png
Added:      /docs/image/002046.png
Added:      /docs/image/004396.png
Added:      /docs/image/006400.png
Added:      /docs/image/6802cf.png
Added:      /docs/image/374557.png
Added:      /docs/image/900000.png
Added:      /docs/image/benchmark.png
Added:      /docs/image/bf5702.png
Added:      /docs/image/ff0000.png

Modified:   /docs/benchmark.md
            -- Added --
                whole documentation content about benchmark usage

Modified:   /docs/module.md
            -- Updated --
                changed italic strings in list to bold

Modified:   /BLUE_FRAMEWORK/packages/CORE/error_class.php
            -- Updated --
                changed default color in error_class __construct tracer