Update README with algorithm execution instructions

Added instructions for running algorithms from the command line.

Author: meenaksh06

README.md

@@ -50,3 +50,19 @@ We are on [Discord](https://the-algorithms.com/discord) and [Gitter](https://git
 ## 📜 List of Algorithms
 
 See our [directory](DIRECTORY.md) for easier navigation and a better overview of the project.
+
+## ▶️ Running an Algorithm
+
+Most algorithms in this repository can be executed directly from the command line.
+
+```bash
+python path/to/algorithm.py
+```
+
+For example:
+
+```bash
+python searches/binary_search.py
+```
+
+Many implementations include doctests, assertions, or example usage that will run automatically when the file is executed.