remove IntelliJ project folder and add let git ignore it in the future #79
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Since this is a Maven-based build system, the IntelliJ project files and folder should not be committed to git. Also, while looking into the ed25519.iml file, I realized different dependencies are used.
That might lead to confusion for other developers.
Any feedback welcome
PS: When applying this patch, this will break the project files for the ones, using Intellij.
But, thatäs not a big deal, since it just takes a handful of clicks to re-import it.