MAINT: Add community guidelines

Author: effigies

.github/CODE_OF_CONDUCT.md

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+# Community Guidelines
+
+Nibabel is a [NIPY](https://nipy.org) project, and we strive to adhere to the
+[NIPY Community Code](https://nipy.org/conduct.html), reproduced below.
+
+The NIPY community is a community of practice devoted to the use of the Python programming language
+in the analysis of neuroimaging data. The following code of conduct is a guideline for our behavior
+as we participate in this community.
+
+It is based on, and heavily inspired by a reading of the Python community code of conduct, the
+Apache foundation code of conduct, the Debian code of conduct, and the Ten Principles of Burning
+Man.
+
+## The code of conduct for the NIPY community
+
+The Neuroimaging in Python (NIPY) community is made up of members with a diverse set of skills,
+personalities, background, and experiences. We welcome these differences because they are the
+source of diverse ideas, solutions and decisions about our work. Decisions we make affect users,
+colleagues, and through scientific results, the general public. We take these consequences
+seriously when making decisions. When you are working with members of the community, we encourage
+you to follow these guidelines, which help steer our interactions and help keep NIPY a positive,
+successful, and growing community.
+
+### A member of the NIPY community is:
+
+#### Open
+
+Members of the community are open to collaboration. Be it on the reuse of data, on the
+implementation of methods, on finding technical solutions, establishing best practices, and
+otherwise. We are accepting of all who wish to take part in our activities, fostering an
+environment where anyone can participate and everyone can make a difference.
+
+#### Be collaborative!
+
+Our work will be used by other people, and in turn we will depend on the work of others. When we
+make something for the benefit of others, we are willing to explain to others how it works, so that
+they can build on the work to make it even better. We are willing to provide constructive criticism
+on the work of others and accept criticism of our own work, as the experiences and skill sets of
+other members contribute to the whole of our efforts.
+
+#### Be inquisitive!
+
+Nobody knows everything! Asking questions early avoids many problems later, so questions are
+encouraged, though they may be directed to the appropriate forum. Those who are asked should be
+responsive and helpful, within the context of our shared goal of improving neuroimaging practice.
+
+#### Considerate
+
+Members of the community are considerate of their peers. We are thoughtful when addressing the
+efforts of others, keeping in mind that often-times the labor was completed simply for the good of
+the community. We are attentive in our communications, whether in person or online, and we are
+tactful when approaching differing views.
+
+#### Be careful in the words that you choose:
+
+We value courtesy, kindness and inclusiveness in all our interactions. Therefore, we take
+responsibility for our own speech. In particular, we avoid:
+
+ * Personal insults.
+ * Violent threats or language directed against another person.
+ * Sexist, racist, or otherwise discriminatory jokes and language.
+ * Any form of sexual or violent material.
+ * Sharing private content, such as emails sent privately or non-publicly, or unlogged forums such
+   as IRC channel history.
+ * Excessive or unnecessary profanity.
+ * Repeated harassment of others. In general, if someone asks you to stop, then stop.
+ * Advocating for, or encouraging, any of the above behaviour.
+
+#### Try to be concise in communication
+
+Keep in mind that what you write once will be read by many others. Writing a short email means
+people can understand the conversation as efficiently as possible. Even short emails should always
+strive to be empathetic, welcoming, friendly and patient. When a long explanation is necessary,
+consider adding a summary.
+
+Try to bring new ideas to a conversation, so that each message adds something unique to the
+conversation. Keep in mind that, when using email, the rest of the thread still contains the other
+messages with arguments that have already been made.
+
+Try to stay on topic, especially in discussions that are already fairly long and complex.
+
+#### Respectful
+
+Members of the community are respectful. We are respectful of others, their positions, their
+skills, their commitments, and their efforts. We are respectful of the volunteer and professional
+efforts that permeate the NIPY community. We are respectful of the processes set forth in the
+community, and we work within them. When we disagree, we are courteous and kind in raising our
+issues.
+
+## Incident Reporting
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting
+project maintainer Chris Markiewicz <[email protected]>. All complaints will be reviewed and
+investigated and will result in a response that is deemed necessary and appropriate to the
+circumstances. The project team is obligated to maintain confidentiality with regard to the
+reporter of an incident.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face
+temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+The vast majority of the above was taken from the NIPY Code of Conduct.
+Incident reporting guidelines were adapted from the [Contributor
+Covenant](https://www.contributor-covenant.org/), version 1.4, available at
+https://www.contributor-covenant.org/version/1/4/code-of-conduct.