Add upcoming changes and subscription details for ICON-CH1/2-EPS

Author: mchaamsler

changelog/ICON-CH1-CH2-EPS/upcoming-changes-changelog

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+# ICON-CH1/2-EPS - Upcoming changes & changelog
+
+This page announces upcoming changes to the configuration of the [ICON-CH1/2-EPS forecasts](https://opendatadocs.meteoswiss.ch/e-forecast-data/e2-e3-numerical-weather-forecasting-model). 
+
+These changes may concern the meteorology of the ICON model, or technical properties of the forecast data, like the GRIB2 coding.
+
+## Upcoming changes
+- 2025-11-12 - ICON Info: Improved precipitation, radiation, and temperature *PDF forthcoming*
+
+## Stay in the loop!
+
+If you want to be informed about changes, you can join the ICON-CH1-EPS, and ICON-CH2-EPS mailing lists.
+
+Mails sent via these lists will also inform you about forecast delays, and cancellations.
+
+**Join the ICON-CH1-EPS mailing list**
+
+To subscribe or unsubscribe, please send an email to ICON@news.meteoswiss.ch with
+- either `subscribe ICON-CH1-EPS_list,hans.muster@test.ch`
+- or `unsubscribe ICON-CH1-EPS_list,hans.muster@test.ch` as subject.
+
+**Join the ICON-CH2-EPS mailing list**
+
+To subscribe or unsubscribe, please send an email to ICON@news.meteoswiss.ch with
+- either `subscribe ICON-CH2-EPS_list,hans.muster@test.ch`
+- or `unsubscribe ICON-CH2-EPS_list,hans.muster@test.ch` as subject.
+
+:::warning
+Check carefully, that there is no blank between the name of the list, the comma, and the email address you wish to register and unregister, respectively.
+
+You will receive a confirmation mail to the email address from which you sent the registration. Please reply to this mail without any comments for the action to become effective. 
+:::
+
+## Changelog
+- (Date: Title) *PDF forthcoming*