Update README.md for better usage instructions
Update README.md for better usage instructions

Helps specify installation instructions regarding the a tag that wraps fluidbox images
GerHobbelt/Fluidbox,jgrummel/Fluidbox,lukaserat/Fluidbox,lukaserat/Fluidbox,aguynamedirvin/Fluidbox,zonayedpca/Fluidbox,zonayedpca/Fluidbox,GerHobbelt/Fluidbox,aguynamedirvin/Fluidbox,mcanthony/Fluidbox,mcanthony/Fluidbox,jgrummel/Fluidbox