Update issue templates

Author: RogerChern

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,43 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Screenshots or stack traces**
+If applicable, add screenshots or stack traces to help explain your problem.
+
+**Which config are you using**
+
+**Which dataset are you using **
+
+**Hardware info**
+CPU, GPU, Storage(Disk or NFS)
+
+**Software info**
+driver, CUDA, cuDNN versions
+OS verison
+
+**How did you set up your MXNet for SimpleDet**
+
+
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.