Merge pull request #1 from kunalvishnoi/day-0

cpp add for day-0

Author: geekayush

Day0-HelloWorld/C++/main_kunal.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+
+using namespace std;
+
+int main() {
+   string input_string; 
+   getline(cin, input_string); 
+   cout << "Hello, World." << endl;
+   cout << input_string;
+   return 0;
+}