add a placeholder page for ISS 2025 (#7)

docs/iss/2025.md

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+# 2025 Improving Scientific Software Conference
+
+## About ISS
+
+The annual Improving Scientific Software Conference organized by the UCAR Software Engineering
+Assembly (SEA) will take place in spring 2025 as a hybrid event in Boulder, Colorado and virtually.
+
+### Audience
+
+The conference is for staff and students at research institutions, universities, and in industry who
+are interested in learning and discussing the latest developments and practices in scientific
+software. Those working in the geosciences will likely find it most relevant. However, anyone who
+finds the agenda beneficial to them is welcome to attend even if they do not fit the category
+previously stated.
+
+## Registration and Logistics
+
+More information coming soon!
+
+## Code of Conduct
+
+UCAR and NSF NCAR are committed to providing a safe, productive, and welcoming environment for all
+participants in any conference, workshop, field project or project hosted or managed by UCAR, no
+matter what role they play or their background. This includes respectful treatment of everyone
+regardless of gender, gender identity or expression, sexual orientation, disability, physical
+appearance, age, body size, race, religion, national origin, ethnicity, level of experience,
+political affiliation, veteran status, pregnancy, genetic information, as well as any other
+characteristic protected under state or federal law.
+
+**All participants are required to abide by this [Code of Conduct](https://www.ucar.edu/who-we-are/ethics-integrity/codes-conduct/participants).**