Create proper jar generation project

META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Main-Class: sig.PolygonFill
+Created-By: 11.0.13 (Azul Systems, Inc.)
+

clean

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+find . -type f -name "*.class" -delete
+rm manifest

run

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+PROGRAM_NAME="PolygonFill"
+MAIN_CLASS="sig.PolygonFill"
+
+rm -Rf bin/*
+javac -Xlint:unchecked -cp src -d bin src/sig/${PROGRAM_NAME}.java
+printf "\n\n\nGenerating Manifest...\n\n"
+touch manifest
+echo "Main-Class: ${MAIN_CLASS}" >> manifest
+printf "\n\n\nCreating Jar...\n\n"
+cd bin
+jar cfm ${PROGRAM_NAME}.jar ../manifest sig
+printf "\n\n\nRunning Program...\n\n"
+java -jar ${PROGRAM_NAME}.jar
+cd ..
+./clean