added issue template

.github/ISSUE_TEMPLATE/issue_template.md

@@ -0,0 +1,45 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Describe the Issue
+A clear and concise description of what the issue is.
+
+## Example Router Code
+Please provide the itty-router code related to the issue. If possible, create a minimal, reproducible example.
+
+```ts
+// your code here
+
+```
+
+## Request Details
+- Method: [e.g., GET, POST, PUT, DELETE]
+- URL: [e.g., /api/v1/users]
+- Request Body: If applicable, include the request body.
+- Request Headers: If applicable, include the request headers.
+
+## Steps to Reproduce
+Steps to reproduce the behavior:
+1. Run '...'
+2. Send request to '....'
+3. See error
+
+## Expected Behavior
+A clear and concise description of what you expected to happen.
+
+## Actual Behavior
+A clear and concise description of what actually happens. Include any error messages or unexpected responses.
+
+## Environment (please complete the following information):
+- Environment: [e.g., Node, Bun, Cloudflare Workers, Service Workers, Browser]
+- itty-router Version: [e.g., 1.0.0]
+- Other Relevant Libraries and their versions: [e.g., node 14.0.0]
+
+## Additional Context
+Add any other context about the problem here.