Create bug.yaml

.github/ISSUE_TEMPLATE/bug.yaml

+name: Bug report
+description: Viewer bug report
+labels: [bug]
+body:
+- type: markdown
+  attributes:
+    value: |
+      - Write a descriptive bug title above.
+      - Search [open](https://github.com/secondlife/viewer/issues?q=is%3Aopen+label%3Abug+is%3Aissue) bugs to ensure that the issue has not already been identified.
+
+- type: textarea
+  attributes:
+    label: Environment
+    description: About Second Life Text
+    placeholder: ex. Second Life Test 7.1.3.240191747 (64bit) ...
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Description
+    description: Explain the problem.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Reproduction steps
+    description: Steps to reproduce this bug
+    placeholder: |
+      1. First step
+      2. Second step
+      Expected: ...
+      Actual: ...
+  validations:
+    required: true