Implement Dijkstra's Algorithm

[pixelfac]

Takes 2 strings, both handles of twitter users in the graph
return distance if connected, -1 if not
Implement solution in C:\Users\pixel\OneDrive\Documents\School\COP3530\GraphLinker\Unity_Project\Assets\Scripts\Pathfinder.cs

[pixelfac]

Edge weight = 1/followers (to prioritize pathing through celebs)