Add some examples and more documentation to the exclude file.

config/csync_exclude.conf

@@ -1,5 +1,7 @@
 # Exclude patterns (one per line).  Blank lines in the file and
 # lines starting with '#' are ignored.
+#
+# You can use shell wildcard patterns. See the manpage of sh(1)
 
 .beagle
 .ccache
@@ -12,3 +14,9 @@
 .mozilla/firefox/*/Cache
 .snapshot
 .thumbnails
+
+# exclude all object file
+# *.o
+
+# exclude all bak files
+# *.bak