docs: add README for CPP section with compile & contribution guide

CPP/README.md

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+# C++ Folder Guide — DSA Collection
+
+Welcome to the C++ section of the DSA-Collection repository!  
+This guide explains how to compile and execute C++ files, follow naming conventions, and contribute effectively.
+
+---
+
+##  Folder Structure
+
+Each folder below represents a category of data structures or algorithms:
+
+
+```text
+CPP/
+├── Array/
+├── Backtracking/
+├── Basics/
+├── BinarySearchTree/
+├── Heap/
+├── SystemDesign/
+├── dynamic-programming/
+├── graph/
+├── linked-list/
+├── pattern/
+├── searching/
+├── sorting/
+├── strings/
+├── tree-algorithm/
+└── tree/
+
+````
+
+Each folder contains one or more `.cpp` files implementing specific problems.
+
+---
+
+##  How to Compile and Run a C++ File
+
+To compile and execute C++ programs, make sure you have a **C++ compiler** installed (e.g., `g++`, part of GCC).  
+You can check your version by running:
+
+```bash
+g++ --version
+````
+
+### 1️⃣ Navigate to the directory of your desired file
+
+```bash
+cd CPP/sorting
+```
+
+### 2️⃣ Compile the file
+
+```bash
+g++ filename.cpp -o output
+```
+
+For modern C++ features (e.g., C++17):
+
+```bash
+g++ -std=c++17 filename.cpp -o output
+```
+
+### 3️⃣ Run the program
+
+```bash
+./output
+```
+
+###  Example
+
+```bash
+g++ quick_sort.cpp -o quick_sort
+
+
+