Added --findSubgraph to Main and wrote description on MoleculeDatabase

import java.net.ConnectException;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.ArrayList;

public class Main {

                    printVerbose("FOUND");

                }

                break;

            case "--findSubgraph":

                ArrayList<Molecule> mList = moleculeDb.findSubgraph(new Molecule(moleculePath));

                if (mList.isEmpty())

                    System.out.println("No subraphs found");

                else

                    for(Molecule m: mList)

                        System.out.println(m.moleculeName);

                break;

            default:

                printVerbose("unrecognized command: " + cmd);

                break;

        return null; // Return null if molecule not found

    }

    /**

     * Find all molecules that contain the @param subgraph

     * @param molecule subgraph

     * @return List of molecules that contain subgraph

     */

    public ArrayList<Molecule> findSubgraph(Molecule molecule) {

        ArrayList<Molecule> returnList = new ArrayList<Molecule>();

        int startingNumber = molecule.getNumAtoms();