Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: Bug
+assignees: hathach
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Set up (please complete the following information):**
+ - OS: [e.g. Ubuntu 18.04]
+ - Board: [e.g pca10056]
+ - Firmware Code: [e.g examples/device/cdc_msc_hid]
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.