Proposed template for bug reporting (#226)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,61 @@
+name: Bug report
+description: Report to help us reproduce the bug
+title: "[Bug]: "
+
+body:
+- type: markdown 
+  attributes:
+    value: >
+        ## Thanks for taking the time to fill out this report
+- type: markdown 
+  attributes:
+    value: >
+       ### Before submitting a bug, please make sure it has not been reported in the 
+       [list of issues](https://github.com/narwhals-dev/narwhals/issues).
+- type: textarea
+  attributes:
+    label: Describe the bug
+    description: >
+       A clear description of the bug.
+  validations:
+       required: true
+- type: textarea
+  attributes:
+    label: Steps or code to reproduce the bug
+    description: |
+       Please add a minimal code example to reproduce the bug.
+  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. 
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Versions
+    render: shell
+    description: |
+      What version of Narwhals and dataframe libraries are you running?
+      You could run the following and provide the output below.
+      ```
+      pip freeze | grep -E "narwhals|polars|pandas|modin|cudf"
+      ```
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Relevant log output
+    description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+    render: shell

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+- name: Discord server
+  url: https://discord.gg/V3PqtB4VA4)
+  about: | 
+      Developers and users can be found on the Discord server.
+      Please note that GitHub Discussions should be used in most cases instead.  
+- name: Blank issue
+  url: https://github.com/narwhals-dev/narwhals/issues/new
+