Create string-reverse.cpp (#113)

* Create string_reverse.cpp

* Update string_reverse.cpp

* Rename string_reverse.cpp to string-reverse.cpp

following the naming convention of the repository

* docs: update string index readme

add string-reversal in the string index readme

Co-authored-by: Arsenic <54987647+Arsenic-ATG@users.noreply.github.com>

strings/README.md

@@ -7,6 +7,7 @@
 3. [KMP String Searching](c-or-cpp/kmp.cpp)
 4. [Rabin Karp String Searching](c-or-cpp/rabin-karp.cpp)
 5. [String Tokeniser](c-or-cpp/string-tokeniser.cpp)
+6. [String Reversal](c-or-cpp/string-reverse.cpp)
 
 ### C#
 

strings/c-or-cpp/string-reverse.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+#include<string>
+#include<algorithm>
+using namespace std;
+int main() {
+    string s;
+    cin>>s;
+reverse(s.begin(),s.end());
+cout<<s;
+return 0;
+
+}