Add readme and improve issue templates

Hi,

This MR introduces:

1. README file;
2. Improve the issue bug template;
3. Add a new template for the feature request;

This MR request was heavily inspired in the following pages:

• https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/.gitlab/issue_templates/Bug%20Report.md
• https://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html

Please, let me know if you have any feedback about this MR.