update code/morley/README.md for libsodium dependency
Description
I updated code/morley/README.md to explain that for the stack and cabal installation options, you must first install libsodium. I made this change because I wasted a couple hours figuring out I needed to do that, and wanted to save others the trouble.
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If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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