git: Add script 'tags.sh' for emacs tags file.

tags.sh

@@ -0,0 +1,9 @@
+#! /bin/sh
+
+# Command line to generate TAGS file for Emacs
+
+find . -name "*.py" -print | etags -
+
+# Command line to generate TAGS file for Vim
+
+# ctags -R .