add figure s1 readme

studies/FieldExperimentalDesign/resources/README.md

+<img src=./SupplementaryFigureS1.png width=60%>
+
+**Supplementary Fig. S1**: Air temperature and precipitation recorded during the field
+experiments in Bonn, Cologne, Düsseldorf. Dashed, solid, and dotted represent the
+maximum, average, and minimum temperature of one day, respectively. Green, purple
+and orange color represent three location Bonn, Cologne and Düsseldorf, respectively. The
+temperature data of Düsseldorf from 2021/04/24 to 2021/04/25 was missing. 
+
+## Figure Source
+
+https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/jxb/75/16/10.1093_jxb_erae198/3/erae198_suppl_supplementary_figures_s1-s7.pdf?Expires=1734506953&Signature=GYSCYBYfRHkM41-kJRdWE4i4nrdF~9zwYjFWz3Wb-OizhbqKvIOp94dhTVr~cQkZtjMTZCiUq9dZswP0UQz6uua9Gp67LhRa7DxwkiTHmibaVmWE8yjh3XEwwax8B7VBPss~M4YcQuzatLXyAj01TK0AEIvXAxIyvMRINrLIOaTk9KKmkyMqbpUQXHAzGVrOuBaqW-vIsbpymNvnvIo2KyJGOVw2El9MEhdQAXjRPh94dbJcvD9U-h5-tqUpMffYyWtK6NFExYLdYKeMu-WmhzP-eyLCmAYlIDB2KnMH6aruSgtecGP1iL2pPgt~CUBdlHpURLS2AjX4el3G~2Jf4w__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA
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