Initial class construction

Git/mingw64/libexec/git-core/mergetools/winmerge

@@ -0,0 +1,15 @@
+diff_cmd () {
+	"$merge_tool_path" -u -e "$LOCAL" "$REMOTE"
+	return 0
+}
+
+merge_cmd () {
+	# mergetool.winmerge.trustExitCode is implicitly false.
+	# touch $BACKUP so that we can check_unchanged.
+	"$merge_tool_path" -u -e -dl Local -dr Remote \
+		"$LOCAL" "$REMOTE" "$MERGED"
+}
+
+translate_merge_tool_path() {
+	mergetool_find_win32_cmd "WinMergeU.exe" "WinMerge"
+}