Add greedy algorithms

[bashbers]

Implement a greedy algorithm inside the greedy folder.

Follow the contribution guidelines inside the readme.md and reference this issue whenever you implement an issue 👍

• Counting coins
• Travelling Salesman Problem
• Job Scheduling Problem
• Knapsack Problem
• Dijkstra's Algorithm
• Bellman-Ford Algorithm
  Happy hacking! ✨

[rexiaxm7]

I'll take Dijkstra's Algorithm.

[rexiaxm7]

I'll take Knapsack Problem.