Added naming convention

[vkresch]

Reference to a related issue in the repository

Related to issue in OSI for naming conventions.

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Adding the interface naming convention to the index.

Check the checklist

• I have performed a self-review of my own code/documentation.
• My documentation changes are related to another repository in the organization. Here is the link to the issue/repo.
• My changes generate no new warnings during the documentation generation.
• The existing travis ci which pushes the documentation to gh-pages passes with my changes.