Add bug report template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,34 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Logs**
+If applicable, please include the relevant logs that indicate a problem and/or the log directory of your node. By default, this can be found at `~/.avalanchego/logs/`.
+
+**Metrics**
+If applicable, please include any metrics gathered from your node to assist us in diagnosing the problem.
+
+**Operating System**
+Which OS you used to reveal the bug.
+
+**Additional context**
+Add any other context about the problem here.
+
+Avalanche Bug Bounty program can be found [here](https://hackenproof.com/avalanche/avalanche-protocol).