Create tx_e_gasmonitor.yaml (#4441)
* Create tx_e_gasmonitor.yaml
Added support for tx-e gas monitor.
Gas alarm will appear in the security section and gas level and temperature in the area.
* Update tx_e_gasmonitor.yaml
Fix lint issues, correctly add name and value for the temperature alarm
* Update tx_e_gasmonitor.yaml
Move the alarm upper limit to the config category so it's not automatically shown on a dashboard
* Update DEVICES.md
Added to the devices readme
* feat (tx_e_gasmonitor): use default names where possible
- default names allows translations to be used, so avoid overriding them unnecessarily
- add move temperature alarm state attribute to binary_sensor
PR #4441
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Co-authored-by: Jason Rumney <make-all@users.noreply.github.com>