Add CITATION.cff and a code of conduct

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+type: software
+title: "microdf: Weighted DataFrames and Series for Survey Microdata Analysis"
+url: "https://github.com/PolicyEngine/microdf"
+repository-code: "https://github.com/PolicyEngine/microdf"
+abstract: "Weighted pandas DataFrames and Series for survey microdata, with distributional statistics including weighted quantiles, Gini, income shares and Foster-Greer-Thorbecke poverty measures."
+license: MIT
+version: 1.5.10
+doi: 10.5281/zenodo.22829459
+identifiers:
+  - type: doi
+    value: 10.5281/zenodo.22829459
+    description: "Concept DOI, resolving to the latest archived version"
+  - type: doi
+    value: 10.5281/zenodo.22831047
+    description: "Archived version 1.5.9"
+authors:
+  - family-names: Ahmadi
+    given-names: Vahid
+    orcid: "https://orcid.org/0009-0004-1093-6272"
+    affiliation: "PolicyEngine, Washington, DC, United States"
+  - family-names: Ghenis
+    given-names: Max
+    orcid: "https://orcid.org/0000-0002-1335-8277"
+    affiliation: "PolicyEngine, Washington, DC, United States"
+  - family-names: Juaristi
+    given-names: María
+    orcid: "https://orcid.org/0009-0007-4946-2248"
+    affiliation: "PolicyEngine, Washington, DC, United States"
+  - family-names: Woodruff
+    given-names: Nikhil
+    orcid: "https://orcid.org/0009-0009-5004-4910"
+    affiliation: "PolicyEngine, Washington, DC, United States"
+keywords:
+  - survey statistics
+  - microdata
+  - inequality
+  - poverty
+  - pandas
+  - Python

CODE_OF_CONDUCT.md

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+# Contributor covenant code of conduct
+
+## Our pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible 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.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+hello@policyengine.org. All complaints will be reviewed and investigated
+promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+[homepage]: https://www.contributor-covenant.org

changelog.d/citation-coc.added.md

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+Adds CITATION.cff and a code of conduct.