Add some configs file for code quality tools

[Sigmanificient]

Just adding a few config files:

• .gitattributes: Ensure that the repository code has proper end of lines

• .scrutinizer.yml: Scrutinizer CI. A tool getget global view upon code quality.

• .sourcery.yaml: Sourcery Config. A tool I use to check upon code metrics

[Sigmanificient]

This pr might not be the most useful to you, but it will help me to improve the codebase & find here code quality can be improved