bw/bundles/snmp-temperature-monitoring: add README

bundlewrap/bundles/snmp-temperature-monitoring/README.md

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+# snmp-temperature-monitoring
+
+Alerts operators about devices exceeding the specified operating
+temperature.
+
+Currently temperature limits are hardcoded at 75°C/80°C (warn/error) for
+ComWare 5 devices, and 80°C/90°C for RouterOS devices.
+
+For ComWare 5 devices, stacks up to three devices will be monitored.
+
+```toml
+[metadata.snmp-temperature-monitoring]
+# list of hostnames of devices running Mikrotik RouterOS
+routeros = ["switch-routeros.example.com"]
+
+# list of hostnames of devices running HP ComWare 5
+comware5 = ["switch-comware5.example.org"]
+```