create base documentation (issue #59)

This version introduces multiple enhancements:

added some new documentation files
updated template documentation, create header of package documentation and added whole description into module documentation

Details of additions/deletions below:
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Added:      /docs/scripts_and_styles.md
            -- Added --
                to create documentation about css and js files

Added:      /docs/how_it_works.php
            -- Added --
                to describe step by step how works framework core works

Modified:   /docs/package.md
            -- Added --
                main header

Modified:   /docs/template.md
            -- Added --
                description about some missing special messages block marker

Modified:   /docs/module.md
            -- Added --
                whole create and usage module documentation