添加06.2.md和相关的例子与问题解答

eBook/examples/chapter_6/minmax.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+func main() {
+    var min, max int
+    min, max = MinMax(78, 65)
+    fmt.Printf("Minmium is: %d, Maximum is: %d\n", min, max)
+}
+
+func MinMax(a int, b int) (min int, max int) {
+        if a < b {
+            min = a
+            max = b
+        } else { // a = b or a < b
+            min = b
+            max = a
+        }
+        return
+}