README: update runelite-api description, add runelite-client description [ci skip]
README: update runelite-api description, add runelite-client description [ci skip]

runelite/runelite,Noremac201/runelite,l2-/runelite,devinfrench/runelite,Sethtroll/runelite,Noremac201/runelite,abelbriggs1/runelite,runelite/runelite,abelbriggs1/runelite,runelite/runelite,KronosDesign/runelite,l2-/runelite,abelbriggs1/runelite,devinfrench/runelite,Sethtroll/runelite,KronosDesign/runelite