Add new entry for front() method under deque in C++ docs (#7638)

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* Update front.md

Added a new entry on the term front() under deque in C++ in the mentioned address.

* Rename front to front.md

* Update front.md

* Update front.md

formatted md file

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* added code indentation

* Update front.md

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Author: killjoycircuit

content/cpp/concepts/deque/terms/front/front.md

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+---
+Title: '.front()'
+Description: 'Returns a reference to the first element of the deque'
+Subjects:
+  - 'Computer Science'
+  - 'Game Development'
+Tags:
+  - 'Classes'
+  - 'Containers'
+  - 'Deques'
+  - 'OOP'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+In C++, the **`.front()`** [method](https://www.codecademy.com/resources/docs/cpp/methods) returns a reference to the first element in the [deque](https://www.codecademy.com/resources/docs/python/deque).
+
+## Syntax
+
+```pseudo
+deque_name.front()
+```
+
+**Parameters:**
+
+`.front()` does not take any parameters
+
+**Return value:**
+
+- Returns a reference to the first element of the deque.
+  - For a non-const deque, returns `T&` (modifiable).
+  - For a const deque, returns const `T&` (read-only).
+
+## Example
+
+The example below demonstrates use of `.front()` to access the first element in a deque:
+
+```cpp
+#include <iostream>
+#include <deque>
+
+int main() {
+  // Create a deque of integers
+  std::deque<int> numbers;
+
+  // Add some elements to the deque
+  numbers.push_back(100);
+  numbers.push_back(200);
+  numbers.push_back(300);
+
+  // Access the first element using .front()
+  std::cout << "First element: " << numbers.front() << std::endl;
+
+  // Modify the first element
+  numbers.front() = 50;
+
+  // Display updated deque contents
+  std::cout << "Updated deque: ";
+  for (int num : numbers) {
+    std::cout << num << " ";
+  }
+  std::cout << std::endl;
+
+  return 0;
+}
+```
+
+The output of this program will be:
+
+```shell
+First element: 100
+Updated deque: 50 200 300
+```
+
+This shows that `.front()` allows both access and modification of the deque’s first element.
+
+## Codebyte Example
+
+Run the following codebyte example to understand the use of `.front()` method:
+
+```codebyte/cpp
+#include <iostream>
+#include <deque>
+#include <string>
+
+int main() {
+  // Create a deque of strings
+  std::deque<std::string> myDeque;
+
+  // Add elements to the deque
+  myDeque.push_back("Hello");
+  myDeque.push_back("World");
+  myDeque.push_back("!");
+
+  // Print the front element
+  std::cout << "Front element before change: " << myDeque.front() << std::endl;
+
+  // Modify the front element
+  myDeque.front() = "Hi";
+
+  // Print the modified front element
+  std::cout << "Front element after change: " << myDeque.front() << std::endl;
+
+  // Print all elements of the deque
+  std::cout << "Complete deque: ";
+  for (const auto& str : myDeque) {
+    std::cout << str << " ";
+  }
+  std::cout << std::endl;
+
+  return 0;
+}
+```