Added the file new-line-in-cpp.md to Day 2 (#216)

docs/day-02/new-line-in-cpp.md

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+---
+sidebar_position: 4
+title: "Adding New Line in C++"
+description: "Explore various methods to add new line in C++ with illustrative examples."
+sidebar_label: "New Line in C++"
+slug: adding-new-line-in-cpp
+--- 
+
+
+# Adding New Line in C++
+There are two common ways to add a new line in C++: using `"\n"` and `"std::endl"`.
+
+## Using `"\n"`:
+The `"\n"` escape sequence is a simple way to add a new line in C++. It instructs the program to start printing from the next line.
+
+#### Example:
+```cpp
+#include <iostream>
+using namespace std;
+
+int main() {
+    cout << "Hello\n"; // Using newline character (\n)
+    cout << "World\n";
+    return 0;
+}
+```
+
+**Output**:
+```cpp
+Hello
+World
+```
+
+
+## Using `"std::endl"`:
+`std::endl` is a manipulator in the C++ standard library that not only adds a new - line but also flushes the output buffer, ensuring immediate display.
+
+#### Example:
+```cpp
+#include <iostream>
+using namespace std;
+
+int main() {
+    cout << "Hello" << endl; // Using std::endl
+    cout << "World" << endl;
+    return 0;
+}
+
+```
+**Output**:
+```cpp
+Hello
+World
+```
+
+
+## Comparison of `\n` and `endl`:
+Both `"\n"` and `std::endl` produce the same output, but there are differences in their usage and performance.
+
+#### Performance : 
+In terms of performance, `\n` is generally faster than `std::endl`.
+`std::endl` flushes the output buffer, which may impact performance, especially for large outputs. On the other hand, `\n` does not flush the buffer immediately, making it more efficient.
+
+#### Usage:
+
+- Use `std::endl` when you need immediate display of the output or when you want to ensure that certain messages are visible right away, such as in interactive programs or debugging scenarios.
+- Use `\n` in most cases where immediate flushing isn't necessary for better performance.
+
+Understanding the differences between `std::endl` and `\n` helps in choosing the appropriate method based on the requirements of your program.
+
+Feel free to use either method based on your specific needs!