Added bug report template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,31 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] "
+labels: bug
+assignees: ''
+
+---
+
+Please provide as much details as possible, this will help us to deliver a fix as soon as possible.
+Thank you!
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Log and Stack trace**
+Please provide a log and a stack trace (with exception), if applicable.
+
+**To Reproduce**
+Please provide a relevant code snippets to reproduce this bug.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Please complete the following information:**
+- LangChain4j version: e.g. 0.12.0
+- Java version: e.g. 11
+- Spring Boot version (if applicable): e.g. 2.7.13
+
+**Additional context**
+Add any other context about the problem here.