misc: stand with Ukraine

README.md

@@ -3,6 +3,8 @@
 
 A program that calculates your astronomical ephemerides!
 
+[![Stand with Ukraine](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/banner2-direct.svg)](https://github.com/vshymanskyy/StandWithUkraine/blob/main/docs/README.md)
+
 ## Installation
 
 ### Production environment