Configure Sider

Welcome to [Sider](https://sider.review/)!

This is an onboarding PR to help you understand and configure Sider. You can edit the `sider.yml` file in this PR to customize the analysis for your source code by Sider.

If you have any questions, our [document](https://help.sider.review/getting-started/custom-configuration) could help you.

sider.yml

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+# linter:
+# # https://help.sider.review/getting-started/custom-configuration
+
+#   # https://help.sider.review/tools/python/flake8
+#   flake8:
+#     plugins:
+#       - flake8-bandit
+#       - flake8-builtins==1.4.1
+#       - flake8-mypy>=17.3.3
+
+#   # https://help.sider.review/tools/others/misspell
+#   misspell:
+#     exclude:
+#       - vendor
+#       - "**/*.min.js"
+#       - exclude_file.rb
+#     targets:
+#       - target_directory
+#       - another_target_directory/foo.rb
+#       - bar.rb
+#     locale: UK
+#     ignore: center,behavior
+
+#   # https://help.sider.review/tools/shellscript/shellcheck
+#   shellcheck:
+#     target: "src/**/*.{sh,bash}"
+#     include: "SC2104,SC2105"
+#     exclude: "SC1000,SC1118"
+#     enable: "all"
+#     shell: "bash"
+#     severity: "error"
+#     norc: true
+
+# # https://help.sider.review/getting-started/custom-configuration#ignore
+# ignore:
+#   - "*.pdf"
+#   - "*.mp4"
+#   - "images/**"
+
+# # https://help.sider.review/getting-started/custom-configuration#branchesexclude
+# branches:
+#   exclude:
+#     - master
+#     - development
+#     - /^release-.*$/