Add code of conduct

CODE_OF_CONDUCT.md

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+# Aesara Code of Conduct
+
+Like the technical community as a whole, the Aesara team and community is made
+up of a mixture of professionals and volunteers from all over the world, working
+on every aspect of the mission—including mentorship, teaching, and connecting
+people.
+
+Diversity is one of our strengths, but it can also entail communication
+issues and misunderstandings. To that end, we have a few ground rules to which we ask
+everyone to adhere.
+
+This isn’t an exhaustive list of things that you can’t do. Rather, take it in
+the spirit in which it’s intended—a guide to make it easier to enrich all of
+us and the technical communities in which we participate.
+
+This code of conduct applies to all spaces managed by the Aesara project. This
+includes Gitter, mailing lists, the issue tracker, Aesara events, and any other
+forums created by the project team that the community uses for communication.
+In addition, violations of this code outside these spaces may affect a person's
+ability to participate within them.
+
+If you believe someone is violating the code of conduct, we ask that you report
+it by emailing aesara.devs@gmail.com.
+
+- __Be friendly and patient.__
+
+- __Be welcoming.__ We strive to be a community that welcomes and supports people of
+  all backgrounds and identities. This includes, but is not limited to members
+  of any race, ethnicity, culture, national origin, colour, immigration status,
+  social and economic class, educational level, sex, sexual orientation, gender
+  identity and expression, age, size, family status, political belief, religion,
+  and mental and physical ability.
+
+- __Be considerate.__ Your work will be used by other people, and you in turn will
+  depend on the work of others. The decisions you make can affect users and
+  colleagues, so you should take the consequences into consideration. 
+  Remember that we're a world-wide community, so you might not be
+  communicating in someone else's primary language.
+
+- __Be respectful.__ Not all of us will agree all the time, but disagreement is no
+  excuse for poor behavior and poor manners. We might all experience some
+  frustration now and then, but we cannot allow that frustration to turn into a
+  personal attack. It’s important to remember that a community where people feel
+  uncomfortable or threatened is not a productive one. Members of the Aesara
+  community should be respectful when dealing with other members as well as with
+  people outside the Aesara community.
+
+- __Be careful in the words that you choose.__ We are a community of professionals,
+  and we conduct ourselves professionally. Be kind to others. Do not insult or
+  put down other participants. Harassment and other exclusionary behavior aren't
+  acceptable. This includes, but is not limited to:
+
+    - Violent threats or language directed against another person.
+    - Discriminatory jokes and language (e.g. the use of racist and sexist terms).
+    - Posting sexually explicit or violent material.
+    - Posting (or threatening to post) other people's personally identifying
+      information (e.g. "doxing").
+    - Personal insults of any sort.
+    - Unwelcome sexual attention.
+    - Advocating for, or encouraging, any of the above behavior.
+    - Repeated harassment of others. In general, if someone asks you to stop,
+      then stop.
+
+- __When we disagree, try to understand why.__ Disagreements, both social and
+  technical, happen all the time and Aesara is no exception. It is important
+  that we resolve disagreements and differing views constructively. Remember
+  that we’re different. Aesara benefits from its varied community and
+  people from a wide range of backgrounds. Different people have different
+  perspectives on issues. Being unable to understand why someone holds a
+  viewpoint doesn’t mean that they’re wrong. Don’t forget that it is human to
+  err and blaming each other doesn’t get us anywhere. Instead, focus on helping
+  to resolve issues and learning from mistakes.
+
+Adapted from the [Django project](https://www.djangoproject.com/conduct/).