v0.2.3, update docs

.github/CONTRIBUTING.md

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+We appreciate all contributions to improve OpenMixup. We follow the developing standard of MMLab. Please refer to [CONTRIBUTING.md](https://github.com/open-mmlab/mmcv/blob/master/CONTRIBUTING.md) in MMCV for more details about the contributing guideline.

.github/ISSUE_TEMPLATE/----.md

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+---
+name: 寻求帮助
+about: 遇到问题并寻求帮助
+title: ''
+labels: help wanted
+assignees: ''
+---
+
+推荐使用英语模板 General question，以便你的问题帮助更多人。
+
+### 首先确认以下内容
+
+- 我已经查询了相关的 issue，但没有找到需要的帮助。
+- 我已经阅读了相关文档，但仍不知道如何解决。
+
+### 描述你遇到的问题
+
+\[填写这里\]
+
+### 相关信息
+
+1. `pip list | grep "mmcv\|mmcls\|^torch"` 命令的输出
+   \[填写这里\]
+2. 如果你修改了，或者使用了新的配置文件，请在这里写明
+
+```python
+[填写这里]
+```
+
+3. 如果你是在训练过程中遇到的问题，请填写完整的训练日志和报错信息
+   \[填写这里\]
+4. 如果你对 `mmcls` 文件夹下的代码做了其他相关的修改，请在这里写明
+   \[填写这里\]

.github/ISSUE_TEMPLATE/---.md

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+---
+name: 新功能
+about: 为项目提一个建议
+title: '[Feature]'
+labels: enhancement
+assignees: ''
+---
+
+推荐使用英语模板 Feature request，以便你的问题帮助更多人。
+
+### 描述这个功能
+
+\[填写这里\]
+
+### 动机
+
+请简要说明以下为什么需要添加这个新功能
+例 1. 现在进行 xxx 的时候不方便
+例 2. 最近的论文中提出了有一个很有帮助的 xx
+
+\[填写这里\]
+
+### 相关资源
+
+是否有相关的官方实现或者第三方实现？这些会很有参考意义。
+
+\[填写这里\]
+
+### 其他相关信息
+
+其他和这个功能相关的信息或者截图，请放在这里。
+另外如果你愿意参与实现这个功能并提交 PR，请在这里说明，我们将非常欢迎。
+
+\[填写这里\]

.github/ISSUE_TEMPLATE/---bug.md

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+---
+name: 报告 Bug
+about: 报告问题以帮助我们提升
+title: '[Bug]'
+labels: bug
+assignees: ''
+---
+
+推荐使用英语模板 Bug report，以便你的问题帮助更多人。
+
+### 描述 bug
+
+简单地描述一下遇到了什么 bug
+
+\[填写这里\]
+
+### 复现流程
+
+在命令行中执行的详细操作
+
+```shell
+[填写这里]
+```
+
+### 相关信息
+
+1. `pip list | grep "mmcv\|mmcls\|^torch"` 命令的输出
+   \[填写这里\]
+2. 如果你修改了，或者使用了新的配置文件，请在这里写明
+
+```python
+[填写这里]
+```
+
+3. 如果你是在训练过程中遇到的问题，请填写完整的训练日志和报错信息
+   \[填写这里\]
+4. 如果你对 `mmcls` 文件夹下的代码做了其他相关的修改，请在这里写明
+   \[填写这里\]
+
+### 附加内容
+
+任何其他有关该 bug 的信息、截图等
+
+\[填写这里\]

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: '[Bug]'
+labels: bug
+assignees: ''
+---
+
+### Describe the bug
+
+A clear and concise description of what the bug is.
+
+\[here\]
+
+### To Reproduce
+
+The command you executed.
+
+```shell
+[here]
+```
+
+### Post related information
+
+1. The output of `pip list | grep "mmcv\|mmcls\|^torch"`
+   \[here\]
+2. Your config file if you modified it or created a new one.
+
+```python
+[here]
+```
+
+3. Your train log file if you meet the problem during training.
+   \[here\]
+4. Other code you modified in the `mmcls` folder.
+   \[here\]
+
+### Additional context
+
+Add any other context about the problem here.
+
+\[here\]

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+
+contact_links:
+  - name: MMClassification Documentation
+    url: https://mmclassification.readthedocs.io/en/latest/
+    about: Check if your question is answered in docs

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: '[Feature]'
+labels: enhancement
+assignees: ''
+---
+
+### Describe the feature
+
+\[here\]
+
+### Motivation
+
+A clear and concise description of the motivation of the feature.
+Ex1. It is inconvenient when \[....\].
+Ex2. There is a recent paper \[....\], which is very helpful for \[....\].
+
+\[here\]
+
+### Related resources
+
+If there is an official code release or third-party implementation, please also provide the information here, which would be very helpful.
+
+\[here\]
+
+### Additional context
+
+Add any other context or screenshots about the feature request here.
+If you would like to implement the feature and create a PR, please leave a comment here and that would be much appreciated.
+
+\[here\]

.github/ISSUE_TEMPLATE/general-questions.md

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+---
+name: General questions
+about: 'Ask general questions to get help '
+title: ''
+labels: help wanted
+assignees: ''
+---
+
+### Checklist
+
+- I have searched related issues but cannot get the expected help.
+- I have read related documents and don't know what to do.
+
+### Describe the question you meet
+
+\[here\]
+
+### Post related information
+
+1. The output of `pip list | grep "mmcv\|mmcls\|^torch"`
+   \[here\]
+2. Your config file if you modified it or created a new one.
+
+```python
+[here]
+```
+
+3. Your train log file if you meet the problem during training.
+   \[here\]
+4. Other code you modified in the `mmcls` folder.
+   \[here\]

.github/pull_request_template.md

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+Thanks for your contribution to OpenMixup and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. We follow the standard in MMLab, e.g., [MMClassification](https://github.com/open-mmlab/mmclassification). If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.
+
+## Motivation
+
+Please describe the motivation of this PR and the goal you want to achieve through this PR.
+
+## Modification
+
+Please briefly describe what modification is made in this PR.
+
+## BC-breaking (Optional)
+
+Does the modification introduce changes that break the backward compatibility of the downstream repositories?
+If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.
+
+## Use cases (Optional)
+
+If this PR introduces a new feature, it is better to list some use cases here and update the documentation.
+
+## Checklist
+
+**Before PR**:
+
+- [ ] Pre-commit or other linting tools are used to fix the potential lint issues.
+- [ ] Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
+- [ ] The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
+- [ ] The documentation has been modified accordingly, like docstring or example tutorials.
+
+**After PR**:
+
+- [ ] If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
+- [ ] CLA has been signed and all committers have signed the CLA in this PR.