Added and algorithm to check if a number is palindrome

Added the algorithm to convert number to string and check if it's a palindrome.

Palindromeofnumber.cpp

@@ -0,0 +1,20 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+int num;
+cin>>num;
+
+string s1 = to_string(num);
+string s2 = s1;
+
+reverse(s1.begin(),s1.end());
+
+if(s1==s2)
+  cout<<"true";
+else
+  cout<<"false";
+
+return 0;
+}