Merge branch 'master' of https://github.com/Aokison/30-seconds-of-cpp

set/crend.md

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+# crend
+
+**Description :**
+	This method is used to return a const_reverse_iterator pointing to the position preceding the first element of the container. This is useful 
+	when wanting a read-only iterator to iterate a container in reverse order.
+
+**Example :**
+```cpp
+//Run Code To Demonstrate use of set.crend()
+#include<iostream>
+#include<set>
+
+int main() {
+	// Create a set object holding integers
+	std::set<int> myset{ 2, 4, 3, 5, 1 };
+
+	// Iterate through the const_reverse_iterator
+    	std::cout << "myset reversed:";
+	for (auto r_it = myset.crbegin(); r_it != myset.crend(); ++r_it){
+		std::cout << ' ' << *r_it;
+	}
+
+	return 0;
+}
+
+```
+
+**[Run Code](https://rextester.com/YAWBA53642)**