Add install script and desktop entry for Linux

src/main/dist/install.sh

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+#!/bin/sh
+
+# JPass installation script for Linux
+
+# check if java executable exists
+if [ -d "$JAVA_HOME" -a -x "$JAVA_HOME/bin/java" ]; then
+    JAVACMD="$JAVA_HOME/bin/java"
+else
+    JAVACMD=java
+fi
+
+$JAVACMD -version >/dev/null 2>&1
+if [ "$?" != "0" ]; then
+  echo "Install Java (JDK or JRE) if you do not already have. JPass will not work without it."
+  echo "Please make sure PATH, or JAVA_HOME environment variables point to a valid Java installation."
+  echo "Could not execute JPass (exit: $?)"
+  exit
+fi
+
+# detect the absolute path of jpass
+JPASS_HOME=`dirname "$0"`
+
+# detect cygwin
+cygwin=false;
+case "`uname -s`" in
+    CYGWIN*)
+        cygwin=true
+        ;;
+esac
+
+if $cygwin ; then
+    JPASS_PATH=`cygpath "$JPASS_HOME"`
+else
+    JPASS_PATH="$JPASS_HOME"
+fi
+
+echo "Install application to /opt/jpass..."
+if [ ! -d "/opt" ]; then
+  echo "ERROR: /opt folder does not exists"
+  exit
+fi
+
+mkdir -p "/opt/jpass"
+cp -R "$JPASS_PATH" "/opt/jpass"
+
+echo "Add JPass desktop entry..."
+if [ ! -d "/usr/share/applications" ]; then
+  echo "ERROR: Could not create desktop entry: /usr/share/applications is missing"
+  exit
+fi
+
+cp "$JPASS_PATH/jpass.desktop" "/usr/share/applications"
+

src/main/dist/jpass.desktop

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+[Desktop Entry]
+Type=Application
+Encoding=UTF-8
+Name=JPass
+Comment=Password manager with strong encryption
+Exec=/opt/jpass/jpass.sh
+Icon=/opt/jpass/jpass.png
+Terminal=False