Add libsodium to build

res/libsodium/buildlibsodium.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# First thing to do is see if libsodium.a exists in the res folder. If it does, then there's nothing to do
+if [ -f res/libsodium.a ]; then
+    exit 0
+fi
+
+echo "Building libsodium"
+
+# Go into the lib sodium directory
+cd res/libsodium
+if [ ! -f libsodium-1.0.16.tar.gz ]; then
+    wget https://download.libsodium.org/libsodium/releases/libsodium-1.0.16.tar.gz
+fi
+
+if [ ! -d libsodium-1.0.16 ]; then
+    tar xf libsodium-1.0.16.tar.gz
+fi
+
+# Now build it
+cd libsodium-1.0.16
+bash configure
+make -j$(nproc)
+cd ..
+
+# copy the library to the parents's res/ folder
+cp libsodium-1.0.16/src/libsodium/.libs/libsodium.a ../