Added 'add-andrewplan.txt' to contributors folder.
Added 'add-andrewplan.txt' to contributors folder.

diegobust4545/patchwork,joysjsj/patchwork,apound01/patchwork,juliozm20/patchwork,Soumya08pragya/patchwork,elzbeth/patchwork,carufenon/patchwork,SarahSexton/patchwork,Frankyx93/patchwork,rkaranam/patchwork,cadazab/patchwork,colpac64/patchwork,laurenamy/patchwork