added readme for divide and conquer folder

Author: shreyakash24

divide_and_conquer/README.md

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+# Divide and Conquer Algorithms Folder
+
+This folder contains implementations of **Divide and Conquer algorithms**, which solve problems by:
+
+1. Dividing the problem into smaller subproblems
+2. Solving each subproblem recursively
+3. Combining the results to get the final solution
+
+To ensure high-quality contributions, each algorithm should follow the guidelines in `CONTRIBUTING.md`:
+
+- Recursive divide-and-conquer logic
+- Descriptive function and class names
+- Unit tests demonstrating correctness
+- Type hints for all functions
+- Clear code organization
+
+
+### Notes for Contributors
+
+- Focus on **divide-and-conquer implementation**
+- Include **unit tests** for typical and edge cases
+- Keep **functions and classes well-named and typed**
+- Maintain **folder structure and file naming consistency**