Added Bug issue template.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,20 @@
+---
+name: Bug Report
+about: Something is not working as intended
+title: "[Bug]"
+labels: bug
+assignees: bkaankose
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**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.