Add new bug report template

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,82 @@
+name: Bug Report
+description: Create a report to help us reproduce and fix the bug
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      #### Before submitting a bug, please make sure the issue hasn't been already
+      addressed by searching through [the existing and past issues](https://github.com/pytorch/vision/issues?q=is%3Aissue+sort%3Acreated-desc+).
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: >
+      A clear and concise description of what the bug is.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Steps/Code to Reproduce
+    description: |
+      Please add a minimal example so that we can reproduce the error by running
+      the code. It is very important for he snippet to be as succinct (minimal)
+      as possible, so please take time to trim down any irrelevant code to help
+      us debug efficiently. We are going to copy-paste your code and we expect
+      to get the same result as you did: avoid any external data, and include
+      the relevant imports, etc. For example:
+
+      ```python
+      import torch
+      import torchvision
+      from torchvision.ops import nms
+
+      N = 5
+      boxes = torch.rand(N, 4)  # Note: the bug is here, we should enforce that x1 < x2 and y1 < y2
+      scores = torch.rand(N)
+      nms(boxes, scores, iou_threshold=.9)
+      ```
+      If the code is too long (hopefully, it isn't), feel free to put it in a
+      public gist and link it in the issue: https://gist.github.com.
+    placeholder: |
+      ```python
+      Sample code to reproduce the problem
+      ```
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Expected Results
+    description: >
+      Please paste or describe the expected results.
+    placeholder: >
+      Example: No error is thrown.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Actual Results
+    description: >
+      Please paste or describe the results you observe instead of the expected
+      results. If you observe an error, please paste the error message including
+      the **full** traceback of the exception.
+      It may be relevant to wrap error messages in ```` ```triple quotes blocks``` ````.
+    placeholder: >
+      Please paste or specifically describe the actual output or traceback.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Versions
+    description: |
+      Please run the following and paste the output below.
+      ```sh
+      wget https://raw.githubusercontent.com/pytorch/pytorch/master/torch/utils/collect_env.py
+      # For security purposes, please check the contents of collect_env.py before running it.
+      python collect_env.py
+      ```
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!