feat: Added ISSUE template

Author: linkdotnet

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,21 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+<!-- Description -->
+
+**Current behavior**
+<!-- Include steps to reproduce if necessary -->
+
+**Expected behavior**
+<!-- Expected behavior -->
+
+**Version information**
+ - NCronJobVersion:
+ - .NET runtime version: