updated readmes and added linux build scripts

linux/fedora_get_prereqs.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# Install prerequisite packages for SonoBus build on Fedora
+
+GITREPO="https://github.com/essej/paulxstretch.git"
+
+PREREQS="jack-audio-connection-kit \
+	jack-audio-connection-kit-devel \
+	alsa-lib-devel \
+	libX11-devel \
+	libXext-devel \
+	libXinerama-devel \
+	libXrandr-devel \
+	libXcursor-devel \
+	freetype-devel \
+	libcurl-devel \
+	cmake
+        "
+
+echo ""
+echo "Installing prerequisites - " $(date)
+echo ""
+
+sudo dnf update
+sudo dnf -y groupinstall "Development Tools" "Development Libraries"
+sudo dnf -y install git $PREREQS
+
+
+function ver { printf "%03d%03d%03d%03d" $(echo "$1" | tr '.' ' '); }
+
+cmakever=$(cmake --version | head -1 | cut -d" " -f3)
+
+if [ $(ver $cmakever) -lt $(ver 3.16) ] ; then
+  echo "Your CMake is too old! You need version 3.16 or higher. Try to get a newer version, or compile CMake from source."
+  exit 1
+fi
+