Update issue templates (#2670)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+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.
+
+**Logs or terminal output**
+If applicable, add add textual content to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - Distribution: [e.g. Ubuntu 18.04]
+ - Bigchaindb version:
+ - Tendermint version:
+ - Mongodb version:
+- Python full version: [e.g. Python 3.6.6]
+
+**Additional context**
+Add any other context about the problem here.