Add Code of Conduct (algorithm-archivists#597)

* Add a Code of Conduct.

Add a modified version of the Contributor Covenant (v1.4.1).
The following modifications have been made:
- Providing two contact persons instead of just one. This ensures that
  an issue involving the primary contact person can be safely reported.
- Adding a "More Information" section. This section links to a (/an
  upcoming) wiki entry, which holds (/will hold) additional information
  regarding the Code of Conduct.
- Adding angle brackets around bare URLs.
  See here for more information:
  https://github.com/DavidAnson/markdownlint/blob/v0.12.0/doc/Rules.md#md034

* Add a Code of Conduct section.

This section holds two things:
- A note that this project is released with a Code of Conduct and that
  you agree to abide its terms by participating.
- A link to a (/an upcoming) wiki entry, which holds (/will hold)
  additional information regarding the Code of Conduct.

* Make James a primary contact person as well.

Co-Authored-By: leios <[email protected]>

* Fix amibguous sentence in Scope-section.

The first sentence of the Scope-section didn't clearly indicate that the
"when an individual is representing the project or its community"-part
only applies to the second half of the sentence ("in public spaces") and
not the whole sentence.
Therefore change the layout of the sentence to remove all ambiguity.

For more info, see:
EthicalSource/contributor_covenant#659
EthicalSource/contributor_covenant#660

Author: june128

CODE_OF_CONDUCT.md

@@ -0,0 +1,82 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies within all project spaces, and it also applies when
+an individual is representing the project or its community in public spaces.
+Examples of representing a project or community include using an official
+project e-mail address, posting via an official social media account, or acting
+as an appointed representative at an online or offline event. Representation of
+a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting Julian Schacher at <[email protected]> or James Schloss at
+<[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. Further details of specific enforcement
+policies may be posted separately.
+
+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.
+
+## More Information
+
+More information regarding the Code of Conduct can be found in the
+[Code of Conduct wiki entry](https://github.com/algorithm-archivists/algorithm-archive/wiki/Code-of-Conduct).
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at <https://www.contributor-covenant.org/version/1/4/code-of-conduct.html>
+
+[homepage]: <https://www.contributor-covenant.org>
+
+For answers to common questions about this code of conduct, see
+<https://www.contributor-covenant.org/faq>

CONTRIBUTING.md

@@ -1,5 +1,15 @@
 # Contributing
 
+## Code of Conduct
+
+Please note that this project is released with a [Contributor Code of Conduct](./CODE_OF_CONDUCT.md).
+By participating in this project you agree to abide by its terms.
+
+More information regarding the Code of Conduct can be found in the
+[Code of Conduct wiki entry](https://github.com/algorithm-archivists/algorithm-archive/wiki/Code-of-Conduct).
+
+## How to Contribute
+
 A contribution guide on how to contribute to the Arcane Algorithm Archive (AAA) can be found on this Wiki page: https://github.com/algorithm-archivists/algorithm-archive/wiki/How-to-Contribute
 
 The community member Buttercak3 also created a video series, explaining the contribution process of the AAA.  You can find a playlist with all videos here: https://www.youtube.com/playlist?list=PL5NSPcN6fRq2vwgdb9noJacF945CeBk8x