FSLabs Sharklet Abbreviations Guide added

FSLabs EFB - TakeOff

Hello fellow Simmers!

I have added a guide that shows the abbreviations of the TakeOff- and Landing Performance Page. Additionally, the third document added shows the differences the FSLabs Sharklet AddOn will bring to your sim, compared to the original version.

To the FSLabs Sharklet Guides

Happy landings,