Added screen shot to GitHub README.

cosinekitty · cosinekitty · commit 0efcfd974b95 · 2021-05-02T17:11:11.000-04:00
diff --git a/README.md b/README.md
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 # Chenard - an open source chess program
 
+<img src="https://github.com/cosinekitty/chenard/blob/master/chenard_screen_shot.png" width="753" height="600" />
+
 Chenard is a free and open source chess program written in C++.
 The code is very mature and well-tested (started in 1993).
 It is not the strongest AI out there, but it will provide a serious challenge for most people.
