feature: 增加pyproject.toml相关规范

Author: Guo-Zhang

package/config.md

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+# 配置文件
+
+使用`pyproject.toml`，规范详见[setuptools文档](https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html)。
+
+## `[project]`
+
+### `version`选项
+
+遵循语义化版本，从`0.1.0-alpha.1`开始计数。
+
+### `classifiers`选项
+
+示例：
+
+```toml
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "Framework :: Django",
+    "License :: OSI Approved :: BSD License",
+    "Development Status :: 3 - Alpha",
+]
+```
+
+说明：
+
+- 编程语言选Python 3。
+- 如果是Django项目，框架选Django。
+- 证书填使用的。
+- 开发状态默认从阶段3(Alpha)开始，即在内部有使用案例的Alpha阶段。
+
+## `[tool.setuptools]`
+
+```toml
+packages = ["<your_package_dir>"]
+```
+
+注意配置此项，避免`tests`和`exmaple`等文件夹被错误打包。
+

setup/README.md

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+# 文件模板
+
+## `pyproject.toml`
+
+```toml
+[build-system]
+requires = ["setuptools>=61", "setuptools.scm"]
+build-backend = "setuptools.build_meta"
+
+[project]
+# name it as your package name
+name = "<your-package-name>"
+# semetric versions
+version = "0.1.0-alpha.1"
+# describe the package within one sentence
+description = "<your-package-description>"
+authors = [{name = "QuantTide Inc.", email = "[email protected]"}]
+license = {text = "<your-license>"}
+classifiers = [
+    "Programming Language :: Python :: 3",
+]
+requires-python = '>=3'
+dependencies = [
+]
+
+[project.readme]
+file = "README.md"
+content-type = "text/markdown"
+
+[tool.setuptools]
+packages = ["<your_package_dir>"]
+```