Create bass piece class

[Starlight-30036225]

I have defined some early framework for the piece class, this will be stored behind the scenes in the server.

`public class Piece {

protected int x;
protected int y;
protected boolean white;

Piece(int x, int y, boolean white){}

public boolean move(String NewLocation){
    return false;
}

public List<String> GetPossibleMoves() {
    return null;
}

public int getX() {
    return x;
}
public int getY() {
    return y;
}

} interface Diagonal{}

interface Straight{} `

The two interfaces at the bottom will be used for movement like rooks and bishops, and as a queen just uses a combination of these two it will eliminate any redundant code.

[Starlight-30036225]

Get possible moves can be abstracted, as it will need to be refined for every single piece type.

[Starlight-30036225]

I have also created a static factory method inside the bass piece class to create pieces of the correct class. This will help encapsulate piece definition. For now it only returns rooks as i test pieces, but will show when it is completed.