Update README.md

Signed-off-by: Varna Sri Raman <107885988+Varnasr@users.noreply.github.com>

Author: Varnasr

README.md

@@ -59,3 +59,7 @@ See [ROADMAP.md](./ROADMAP.md) for details.
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 You're welcome to fork, adapt, and use — EquityStack is a living repository for better, fairer data workflows.
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+If you use this repository in your work, please cite it as:
+Sri Raman, V. (2025). *[EquityStack/FieldStack]: Reusable Tools for Applied Data Analysis and Evaluation*. GitHub. https://github.com/Varnasr/EquityStack
+