Added crbegin example for std set

set/crbegin.md

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+# crbegin
+
+**Description :**
+	Get a const_reverse_iterator pointing at the last 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.size()
+#include<iostream>
+#include<set>
+
+int main() {
+	// Create a set object holding integers
+	std::set<int> mySet{ 3, 1, 5, 2, 4 };
+
+	// Get a const_reverse_iterator pointing to the last element
+	std::set<int>::reverse_iterator r_it = mySet.crbegin();
+
+	// Iterate through the const_reverse_iterator
+	for (; r_it != mySet.crend(); ++r_it){
+		std::cout << *r_it << std::endl;
+	}
+
+	return 0;
+}
+
+```
+
+**[See Sample code](../snippets/set/crbegin.cpp)**
+**[Run Code](https://ideone.com/ccq58H)**

snippets/set/crbegin.cpp

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+// Follow the Style Guide while submitting code PR.
+// Style Guide => https://github.com/Bhupesh-V/30-Seconds-Of-STL/blob/master/CONTRIBUTING.md/#Style Guide
+/*
+    Author : Cameron Bradley
+    Date : 11/10/2020
+    Time : 12:32
+    Description : Get a const reverse iterator pointing at the last element of the container
+*/
+#include<iostream>
+#include<set>
+
+int main() {
+	// Create a set object holding integers
+	std::set<int> mySet{ 3, 1, 5, 2, 4 };
+
+	// Get a const_reverse_iterator pointing to the last element
+	std::set<int>::reverse_iterator r_it = mySet.crbegin();
+
+	// Iterate through the const_reverse_iterator
+	for (; r_it != mySet.crend(); ++r_it) {
+		std::cout << *r_it << std::endl;
+	}
+
+	return 0;
+}