Adding file extensions to gitattributes file for better diff

[Rafi993]

Describe the bug

Adding file extensions to .gitattributes file for better diff. This issue is mostly inspired by https://tekin.co.uk/2020/10/better-git-diff-output-for-ruby-python-elixir-and-more

Additional context
Git recognises file type better if file extensions are mapped to languages for some languages like ruby. This results in better diff https://tekin.co.uk/2020/10/better-git-diff-output-for-ruby-python-elixir-and-more

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