add README

README

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+Generate test cases like this:
+
+	$ ./generate_testcases.sh
+
+Test a specific case like that:
+
+	$ ./check.sh source pkgc:i386 none all none allowed depends pkgb:any
+
+Check all cases:
+
+	$ ./generate_testcases.sh | while read a b c d e f g h; do ./check.sh $a $b $c $d $e $f $g $h 2>/dev/null; done
+
+Or in parallel:
+
+	$ ./generate_testcases.sh | xargs --max-procs=8 --max-args=8 ./check.sh 2>/dev/null