progress on documentation

	modified:   README.md
	renamed:    doc/config_run.md -> doc/basic_config.md
	new file:   doc/design.md
	new file:   doc/detailed_config.md
	new file:   doc/dev_info.md
	new file:   doc/getting_help.md
	new file:   doc/sending_messages.md
	new file:   doc/status_monitoring.md
	new file:   doc/troubleshooting.md