Update feature_request.md

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,6 +7,9 @@ assignees: ''
 
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+**!!! Please Read This First !!!**\
+If this feature request is to support a device that currently doesn't work, please verify that the device works with tuya-cli first.  If the device cannot be used with tuya-cli, then it won't be possible to add support to tuya-mqtt.  If you can query and control your device with tuya-cli, please post the commands and the functions they perform as part of the feature request.
+
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]