fix permissions, add note on documentation

Makefile

-# makefile for SSM, Simple Stack Machine
-
-default: ssm
-
-DIR_SRC			:= src
-DIR_HELP		:= Help
-DIR_IMGS		:= Images
-DIR_BLD			:= build
-DIR_BLD_JAR		:= build/ssm-classes
-
-SSM_JAR			:= $(DIR_BLD)/ssm.jar
-SSM_SRC			:= $(wildcard $(DIR_SRC)/nl/uu/cs/ssm/*.java) $(wildcard $(DIR_SRC)/nl/uu/cs/ssmui/*.java)
-SSM_SRC_HELP	:= $(wildcard $(DIR_SRC)/$(DIR_HELP)/*.prop)
-SSM_SRC_IMGS	:= $(wildcard $(DIR_SRC)/$(DIR_IMGS)/*.gif) $(wildcard $(DIR_SRC)/$(DIR_IMGS)/*.GIF)
-SSM_MKF			:= Makefile
-
-JAVAC_OPTS		:= -Xlint
-
-ssm: $(SSM_JAR)
-
-$(SSM_JAR): $(SSM_SRC) $(SSM_SRC_HELP) $(SSM_SRC_IMGS) $(SSM_MKF)
-	mkdir -p $(DIR_BLD_JAR) $(DIR_BLD_JAR)/$(DIR_HELP) $(DIR_BLD_JAR)/$(DIR_IMGS)
-	cp $(SSM_SRC_HELP) $(DIR_BLD_JAR)/$(DIR_HELP)
-	cp $(SSM_SRC_IMGS) $(DIR_BLD_JAR)/$(DIR_IMGS)
-	( echo "Manifest-Version: 1.0" ; \
-	  echo "Main-Class: nl.uu.cs.ssmui.Runner" ; \
-	) > $(DIR_BLD)/manifest
-	javac $(JAVAC_OPTS) -d $(DIR_BLD_JAR) $(SSM_SRC) && \
-	cd $(DIR_BLD_JAR) && \
-	jar cmf ../manifest ../$(@F) .
+default:
+	ant package
 
 clean:
-	rm -rf $(DIR_BLD)
-
-dist: ssm
-	cp $(DIR_SRC)/ssm.sh $(DIR_SRC)/ssm.bat $(DIR_BLD) && \
-	cd $(DIR_BLD) && \
-	tar cfz ssm-$(shell date +%Y%m%d).tgz ssm.jar ssm.sh ssm.bat
+	ant clean

README.md

 # ssm
 
+[![pipeline status](https://gitlab.science.ru.nl/mlubbers/ssm/badges/master/pipeline.svg)](https://gitlab.science.ru.nl/mlubbers/ssm/commits/master)
+
 Download the latest version [here][0]
 
 Simple Stack Machine interpreter
 
 Forked from http://www.staff.science.uu.nl/~dijks106/SSM/
 
+### Documentation
+
+For now the documentation is available only from within the program and on:
+http://www.staff.science.uu.nl/~dijks106/SSM/
+
 ### Authors & Contributors
 
 - Atze Dijkstra