Add script for finding classes with the same name

This script migrated from ImageJ:
https://github.com/imagej/imagej/blob/2c503fa63e4ba77e68a2d8104201f6a886b4b0b3/bin/get-duplicate-class-names.sh

Author: ctrueden

Diff for: duplicate-class-names.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+#
+# duplicate-class-names.sh
+#
+
+# Script to print out classes in different packages with the same name.
+#
+# Such name clashes are to be avoided, since when more than one of them
+# is needed in the same source file, it becomes necessary to reference
+# all but one using fully qualified package prefixes.
+
+names=$(git ls-files \*.java |
+	sed -e 's|.*/||' -e 's|\.java$||' |
+	sort |
+	uniq -d)
+for name in $names
+do
+	printf '\t%s\n' $name
+	git ls-files \*/$name.java
+done