Add README explaining the location of the ch13 code

bmeike · bmeike · commit 5e5d15078387 · 2011-08-10T07:52:00.000-07:00
diff --git a/13/README b/13/README
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+
+Chapter 13 uses the code from Chapter 12.
+

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	`1`	`+`
	`2`	`+Chapter 13 uses the code from Chapter 12.`
	`3`	`+`