[Enhance] Update issue form and management file

.github/ISSUE_TEMPLATE/1-bug-report.yml

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+name: "🐞 Bug report"
+description: "Create a report to help us reproduce and fix the bug"
+labels: Bug
+title: "[Bug] "
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        If you have already identified the reason, we strongly appreciate you creating a new PR to fix it [here](https://github.com/open-mmlab/mmselfsup/pulls)!
+        If this issue is about installing MMCV, please file an issue at [MMCV](https://github.com/open-mmlab/mmcv/issues/new/choose).
+        If you need our help, please fill in as much of the following form as you're able.
+
+        **The less clear the description, the longer it will take to solve it.**
+
+  - type: checkboxes
+    attributes:
+      label: Prerequisite
+      description: Please check the following items before creating a new issue.
+      options:
+      - label: I have searched [Issues](https://github.com/open-mmlab/mmselfsup/issues) and [Discussions](https://github.com/open-mmlab/mmselfsup/discussions) but cannot get the expected help.
+        required: true
+      - label: I have read the [documentation](https://mmselfsup.readthedocs.io/en/latest/) but cannot get the expected help.
+        required: true
+      - label: The bug has not been fixed in the [latest version](https://github.com/open-mmlab/mmselfsup).
+        required: true
+
+  - type: dropdown
+    id: task
+    attributes:
+      label: Task
+      description: The problem arises when
+      options:
+        - I'm using the official example scripts/configs for the officially supported tasks/models/datasets.
+        - I have modified the scripts/configs or I'm working on my own tasks/models/datasets.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Environment
+      description: |
+        Please run `python mmselfsup/utils/collect_env.py` to collect necessary environment information and copy-paste it here.
+        You may add additional information that may be helpful for locating the problem, such as
+          - How you installed PyTorch \[e.g., pip, conda, source\]
+          - Other environment variables that may be related (such as `$PATH`, `$LD_LIBRARY_PATH`, `$PYTHONPATH`, etc.)
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Reproduces the problem - code sample
+      description: |
+        Please provide a code sample that reproduces the problem you ran into. It can be a Colab link or just a code snippet.
+        Did you make any modifications on the code or config? Are you clear about what you have modified?
+      placeholder: |
+        ```python
+        # Sample code to reproduce the problem
+        ```
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Reproduces the problem - command or script
+      description: |
+        What command or script did you run?
+      placeholder: |
+        ```shell
+        The command or script you run.
+        ```
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Reproduces the problem - error message
+      description: |
+        Please provide the error message or logs you got, with the full traceback.
+      placeholder: |
+        ```
+        The error message or logs you got, with the full traceback.
+        ```
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Tell us anything else you think we should know.
+      placeholder: |
+        1. What's your expected result?
+        2. What dataset did you use?
+        3. What do you think might be the reason?

.github/ISSUE_TEMPLATE/2-feature-request.yml

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+name: 🚀 Feature request
+description: Suggest an idea for this project
+labels: [Feature-Request]
+title: "[Feature] "
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        We strongly appreciate you creating a PR to implete this feature [here](https://github.com/open-mmlab/mmselfsup/pulls)!
+        If you need our help, please fill in as much of the following form as you're able.
+
+        **The less clear the description, the longer it will take to solve it.**
+
+  - type: textarea
+    attributes:
+      label: What is the problem this feature will solve?
+      placeholder: |
+        E.g., It is inconvenient when \[....\].
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What is the feature?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What alternatives have you considered?
+      description: |
+        Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/3-documentation.yml

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+name: 📚 Documentation
+description: Report an issue related to https://mmselfsup.readthedocs.io/en/latest/.
+labels: "Documentation"
+title: "[Docs] "
+
+body:
+- type: textarea
+  attributes:
+    label: 📚 The doc issue
+    description: >
+      A clear and concise description of what content in https://mmselfsup.readthedocs.io/en/latest/ is an issue.
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Suggest a potential alternative/fix
+    description: >
+      Tell us how we could improve the documentation in this regard.
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/config.yml

@@ -1,6 +1,12 @@
 blank_issues_enabled: false
 
 contact_links:
-  - name: MMSelfSup Documentation
+  - name: 📚 MMSelfSup Documentation
     url: https://mmselfsup.readthedocs.io/en/latest/
     about: Check if your question is answered in docs
+  - name: 💬 Forum
+    url: https://github.com/open-mmlab/mmselfsup/discussions
+    about: Ask general usage questions and discuss with other MMSelfSup community members
+  - name: 🌐 Explore OpenMMLab
+    url: https://openmmlab.com/
+    about: Get know more about OpenMMLab

.owner.yml

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+# assign issues to owners automatically
+assign:
+  issues: enabled # or disabled
+  pull_requests: enabled # or disabled
+  # assign strategy, both issues and pull requests follow the same strategy
+  strategy:
+    # random
+    # round-robin
+    daily-shift-based
+  schedule:
+    '*/1 * * * *'
+  # assignees
+  assignees:
+    - fangyixiao18
+    - soonera
+    - Jiahao000
+    - YuanLiuuuuuu
+    - tonysy
+    - wangbo-zhao
+    - fangyixiao18