moved main method

moved the main method to the mainHub.java file so it runs on open
instead of diveTable.java
mainHub

created a main hub that you can use to navigate the different feature of
this program..currently only opens diveTable and nauiReference.java

still need to work out how to make it so the buttons are only clickable
once
naui dive table picture

just a JFrame that holds the NAUI Dive Table picture as a reference
guide when entering data into the diveTable.
opens when reference button on mainHub.java is clicked
turtle.jpg

idk just some random picture of a turtle. If i have time i can try to
put this as the background pic for the mainHub