add topic tag `abaqus`

[Beliavsky]

I suggest adding the topic abaqus in the About section, as explained at https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/classifying-your-repository-with-topics

[EralpDemir]

Thanks for your suggestions. The code is under development stage. We will consider your comments to make the code with a better structure in the near future.

I keep this query open for this reason.

Thanks, Eralp