Merge master

res/SIGNATURES_README

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+This directory contains the hashes and signatures for zec-qt-wallet
+
+Verify the hashes by running:
+sha256sum -c sha256sum-vX.Y.Z.txt
+
+Verify signatures:
+1. First, import the public key (Available on github 
+   at https://github.com/ZcashFoundation/zec-qt-wallet/blob/master/public_key.asc)
+gpg --import public_key.asc
+
+2. Verify signature 
+gpg --verify <filename.sig> <downloaded-filename-to-verify>
+