Add issue templates and pull request template (#142)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,25 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Bug description**
+
+<!--A clear and concise description of what the bug is.-->
+
+**How to reproduce**
+
+<!--Steps to reproduce the behavior:-->
+
+-
+
+**Expected behavior**
+
+<!--A clear and concise description of what you expected to happen.-->
+
+**Additional details**
+
+<!--Please add context, links, reasons, screenshots, etc.-->