Update README.md

Missing command
xbpeng · Dec 24, 2020 · 91c1564 · 91c1564
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commit 91c1564
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diff --git a/README.md b/README.md
@@ -33,7 +33,7 @@ C++:
 
 - Eigen (http://www.eigen.tuxfamily.org/index.php?title=Main_Page) (Version : 3.3.7)
 
-	``mkdir build``
+	``mkdir build && cd build``
 
 	``cmake ..``