DFTB+ is an open source project, and everyone is welcome to contribute improvements and extensions, provided they are willing to provide their changes under the same license as DFTB+ itself.
The preferred method is to fork the project on github), make your changes and then create a pull request. Your changes should be based on the master branch. Before you start, please familiarise yourself with our developers guide http://dftbplus-develguide.readthedocs.io/en/latest/ to understand our git workflow and style conventions.
Every contributor is welcome to be listed in the AUTHORS.rst file. List yourself by including a change to AUTHORS.rst in your pull request. Contributors should be ordered alphabetically by their family name.
When you contribute to the project, your contribution must align with the Developer Certificate of Origin:
Developer Certificate of Origin
Version 1.1
Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
Developer's Certificate of Origin 1.1
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or
(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or
(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.
(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
By issuing a pull request or contributing code in any other ways to the project, you explicitly declare that your contribution is in accordance with the Developer's Certificate of Origin as described above.
Please, also make sure, that all of your git commits contain your real name and email address; pseudonyms and anonymous contributions unfortunately can not be accepted.