xviserra added hashing

algorithms/CPlusPlus/Hashing/hashing.md

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+# Hashing in C++
+
+## Introduction
+
+Hashing is the process of converting any data into a fixed-size string of characters. It is used to index and retrieve items in a database because it is faster than searching through all the items in the database. 
+
+## Steps
+
+1. Include the unordered_map header file.
+2. Create an instance of the unordered_map.
+3. Insert key-value pairs into the unordered_map.
+4. Retrieve values from the unordered_map.
+
+## Examples
+
+```cpp
+#include <iostream>
+#include <unordered_map>
+
+int main() {
+    std::unordered_map<std::string, int> myMap;
+    myMap["John"] = 25;
+    myMap["Jane"] = 30;
+    std::cout << "John is " << myMap["John"] << " years old." << std::endl;
+    return 0;
+}
+