Adds JFace and Draw2D demo

.gitignore

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+**/bin
+*.so
+**/native-image/*-*.json
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

draw2d/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="gtk"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/org.eclipse.gef"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/jface.standalone"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/org.eclipse.swt"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/Skija"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="res"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

draw2d/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>demo.draw2d</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

draw2d/README.md

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+build source
+```
+./build.sh
+```
+run and generate configuration for native image
+```
+./run.sh -trace
+```
+build native image
+```
+./build.sh -native
+```
+launch 
+```
+./draw2dapp
+```
+Blog: [Graalvm Native Image Demo - JFace and Draw2D](https://www.spket.com/blog/graalvm-native-image-demo-jface-and-draw2d/)

draw2d/build.sh

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+#! /bin/sh
+
+if [ -z "$GRAALVM_HOME" ]; then
+	GRAALVM_HOME=$HOME/tools/graalvm
+fi
+
+LIBS_3RD=../../third-party
+SWT_HOME=$LIBS_3RD/swt
+SKIJA_HOME=$LIBS_3RD/skija
+RCP_HOME=$LIBS_3RD/rcp
+GEF_HOME=$LIBS_3RD/gef
+CP=$SWT_HOME/swt.jar:$SKIJA_HOME/skija.jar:\
+$RCP_HOME/plugins/org.eclipse.jface_3.22.0.v20201106-0834.jar:\
+$RCP_HOME/plugins/org.eclipse.core.commands_3.9.800.v20201021-1339.jar:\
+$RCP_HOME/plugins/org.eclipse.equinox.common_3.14.0.v20201102-2053.jar:\
+$RCP_HOME/plugins/org.eclipse.ui.workbench_3.122.0.v20201122-1345.jar:\
+$GEF_HOME/plugins/org.eclipse.draw2d_3.10.100.201606061308.jar:\
+$GEF_HOME/plugins/org.eclipse.gef_3.11.0.201606061308.jar:\
+$GEF_HOME/plugins/org.eclipse.zest.core_1.5.300.201606061308.jar:\
+$GEF_HOME/plugins/org.eclipse.zest.layouts_1.1.300.201606061308.jar
+
+if [ "$1" = "-native" ]; then
+	$GRAALVM_HOME/bin/native-image -cp bin:res:$CP com.spket.demo.draw2d.Draw2DApp draw2dapp
+else
+	$GRAALVM_HOME/bin/javac -cp res:$CP -d bin -sourcepath src:gtk src/com/spket/demo/draw2d/Draw2DApp.java
+fi