Add more screenshots on the download page to example the mod in action

[NighthowlerStudios]

More clarified version of #10

[NighthowlerStudios]

Short list of good screenshot examples:

Shows what screen you are on
Shows what server you are on
Can show what dimension or biome you are in
Can show if you are paused or not
You can use images stored on your pc as rpc images
You have a bunch of built in placeholders you can use.
And shows you are playing Minecraft.