You can contribute to this project, even as an ordinary user, by:
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subscribing and partecipating to the users' mailing list, answering other people's questions and doubts;
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suggesting improvements and reporting bugs, either to the developers mailing list, or using the Issue section of the gitlab repository.
Information on the mailing lists and on how to report bugs can be found in the Quantum ESPRESSO web site, "Contacts" section.
You can contribute even more by:
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preparing new tests for the test suite: see the Wiki page;
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improving the documentation;
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porting to new/unsupported architectures or configurations;
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implementing new features, or improving existing ones.
For more information, consult the documentation for developers in the Wiki