update the header files of all the existing source files in the project with the Apache License;
update the main article of the DocC documentation catalog;
update the README file;
regenerate the Github Pages documentation from the DocC documentation catalog.
This PR contains the work done to:
* update the header files of all the existing source files in the project with the Apache License;
* update the main article of the `DocC` documentation catalog;
* update the `README` file;
* regenerate the Github Pages documentation from the `DocC` documentation catalog.
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This PR contains the work done to:
DocCdocumentation catalog;READMEfile;DocCdocumentation catalog.