Update issue templates

.github/ISSUE_TEMPLATE/tensorrtx-issue-template.md

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+---
+name: tensorrtx issue template
+about: To understand your issue better
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Env
+
+- GPU, e.g. V100, RTX2080, TX2, Xavier NX, Nano, etc.
+- OS, e.g. Ubuntu16.04, Win10, etc.
+- Cuda version
+- TensorRT version
+
+## About this repo
+
+- which branch/tag/commit are you using?
+- which model? yolov5, retinaface?
+
+## Your problem
+
+- what is your command? e.g. `sudo ./yolov5 -s`
+- what's your output?
+- what output do you expect?