Objective:
    Work with graphs and Kruskals algorithm for minimum spanning trees. I also attached the book we use. Kruskals Alg is on page 419.
Overview:
    The pseudocode for Kruskals algorithm is given in the textbook to find a minimum
    spanning tree of a graph. Your program will find the minimum spanning tree
    among a set of cities in Texas.
Details:
    Write a command-line program that uses Kruskal’s algorithm to find a minimum spanning
    tree of a graph. The graph will be provided as a file named assn9_data.csv. The
    data in the file is in the form of an adjacency list.
    You must use the author’s DisjSets class without modifying it. You can either use
    one of the author’s priority queue classes or you can use the PriorityQueue class
    provided in Java.
    You should output each edge of your minimum spanning tree as the names of the two
    cities and the distance between them. You should also print the sum of all of the
    distances in the tree.