Update contribution guidelines section in README

Fixed formatting consistency by standardizing the link text to use lowercase 'guidelines' to match standard markdown link formatting conventions.

Author: vardhan30016

README.md

@@ -13,8 +13,8 @@ You can run and edit the algorithms, or contribute to them using Gitpod.io (a fr
 ### All algorithms are implemented in Java (for educational purposes)
 These implementations are intended for learning purposes. As such, they may be less efficient than the Java standard library.
 
-## Contribution Guidelines
-Please read our [Contribution Guidelines](CONTRIBUTING.md) before you contribute to this project.
+## contribution guidelines
+Please read our [contribution guidelines](CONTRIBUTING.md) before you contribute to this project.
 
 ## Algorithms
 Our [directory](DIRECTORY.md) has the full list of applications.