Added the Kruskal algo implementation in c

[harshendram]

This pull request adds a complete implementation of Kruskal's algorithm for finding the Minimum Spanning Tree (MST) in a weighted undirected graph. The new code includes all necessary data structures, the algorithm logic, and a sample main function for demonstration.

issue no #216

Implementation of Kruskal's algorithm:

• Added a definition for the Edge struct to represent graph edges with source, destination, and weight. (CPP/algorithms/greedy_algorithms/kruskal_algorithm.cpp)
• Implemented a Disjoint Set Union (DSU) data structure to efficiently manage connected components during MST construction. (CPP/algorithms/greedy_algorithms/kruskal_algorithm.cpp)
• Developed the core kruskalMST function that sorts edges, builds the MST, and calculates its total weight. (CPP/algorithms/greedy_algorithms/kruskal_algorithm.cpp)
• Included a demonstration in main that constructs a sample graph, runs Kruskal's algorithm, and prints the resulting MST and its total weight. (`CPP/algorithms/greedy_algorithms/kruskal_algorithm.

dear maintainers please merge this pr with hacktoberfest2025 and hacktoberfest-accepted labels
@Pradeepsingh61

[github-actions]

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[github-actions]

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[Karanjot786]

it is good @Pradeepsingh61 now you can merge it