Added cpp solution for Concatenation-of-Array

.vscode/settings.json

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+{
+    "files.associations": {
+        "vector": "cpp"
+    }
+}

LeetCode/Concatenation-of-Array/C++/Readme.md

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+How to run the file 
+
+cpp```
+    g++ fileName.cpp
+```

LeetCode/Concatenation-of-Array/C++/Solution.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+
+vector<long long> concatArray(vector<long long> &arr)
+{
+    vector<long long> temp;
+    for (int i = 0; i < arr.size(); i++)
+    {
+        temp.push_back(arr[i]);
+    }
+    for (int i = 0; i < arr.size(); i++)
+    {
+        temp.push_back(arr[i]);
+    }
+    return temp;
+}
+
+int main()
+{
+    long long num;
+    cin >> num;
+
+    vector<long long> arr(num);
+
+    for (int i = 0; i < num; i++)
+    {
+        cin >> arr[i];
+    }
+
+    vector<long long> temp = concatArray(arr);
+
+    for (int i = 0; i < temp.size(); i++)
+    {
+        cout << temp[i] << " ";
+    }
+}