Add the initial EN translation for C++ code (#1346)

en/codes/cpp/chapter_hashing/hash_map.cpp

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+/**
+ * File: hash_map.cpp
+ * Created Time: 2022-12-14
+ * Author: msk397 (machangxinq@gmail.com)
+ */
+
+#include "../utils/common.hpp"
+
+/* Driver Code */
+int main() {
+    /* Initialize hash table */
+    unordered_map<int, string> map;
+
+    /* Add operation */
+    // Add key-value pair (key, value) to the hash table
+    map[12836] = "Ha";
+    map[15937] = "Luo";
+    map[16750] = "Suan";
+    map[13276] = "Fa";
+    map[10583] = "Ya";
+    cout << "\nAfter adding, the hash table is\nKey -> Value" << endl;
+    printHashMap(map);
+
+    /* Query operation */
+    // Enter key to the hash table, get value
+    string name = map[15937];
+    cout << "\nEnter student ID 15937, found name " << name << endl;
+
+    /* Remove operation */
+    // Remove key-value pair (key, value) from the hash table
+    map.erase(10583);
+    cout << "\nAfter removing 10583, the hash table is\nKey -> Value" << endl;
+    printHashMap(map);
+
+    /* Traverse hash table */
+    cout << "\nTraverse key-value pairs Key->Value" << endl;
+    for (auto kv : map) {
+        cout << kv.first << " -> " << kv.second << endl;
+    }
+    cout << "\nIterate through Key->Value using an iterator" << endl;
+    for (auto iter = map.begin(); iter != map.end(); iter++) {
+        cout << iter->first << "->" << iter->second << endl;
+    }
+
+    return 0;
+}