wallet: bash script to make Linux AppImage

bin/darkwallet/release/linux/darkfi.desktop

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+[Desktop Entry]
+Name=DarkFi
+Exec=darkfi
+Icon=darkfi
+Type=Application
+Categories=Utility;

bin/darkwallet/release/linux/make-appimage.sh

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+#!/bin/bash
+
+# Download and install appimagetool into your PATH
+# https://github.com/AppImage/appimagetool/releases/tag/continuous
+
+APPDIR=DarkFi.AppDir/
+rm -fr $APPDIR
+mkdir $APPDIR
+cp darkfi.desktop $APPDIR
+
+cp ../../data/res/mipmap-xxxhdpi/ic_launcher.png $APPDIR/darkfi.png
+cp ../../darkwallet $APPDIR/AppRun
+cp -r ../../assets $APPDIR
+appimagetool $APPDIR
+