docs: add Sphinx + Read the Docs infrastructure

- Add .readthedocs.yaml build config (Ubuntu 22.04, Python 3.11)
- Add docs/conf.py with myst-parser for Markdown support
- Add docs/index.md toctree including README and existing docs
- Add docs/readme.md to include root README via myst directive
- Add docs/requirements.txt for Sphinx build dependencies
- Add docs/_build/ to .gitignore

docs/conf.py

@@ -0,0 +1,33 @@
+# -- Sphinx configuration for easy-tdx ---------------------------------------
+project = "easy-tdx"
+copyright = "2025, Justin Gu"
+author = "Justin Gu"
+
+# The full version, including alpha/beta/rc tags
+release = "1.7.1"
+
+# -- Extensions ---------------------------------------------------------------
+extensions = [
+    "myst_parser",
+]
+
+# -- MyST parser config -------------------------------------------------------
+myst_enable_extensions = [
+    "colon_fence",
+    "deflist",
+]
+
+# Suppress cross-reference warnings for relative links (e.g. docs/*.md, LICENSE)
+suppress_warnings = ["myst.xref_missing"]
+
+# -- HTML output --------------------------------------------------------------
+html_theme = "sphinx_rtd_theme"
+html_theme_options = {
+    "navigation_depth": 3,
+}
+
+# -- Source suffix -------------------------------------------------------------
+source_suffix = {
+    ".rst": "restructuredtext",
+    ".md": "markdown",
+}

docs/index.md

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+# easy-tdx 文档
+
+```{toctree}
+:maxdepth: 2
+:caption: 目录
+
+readme
+api_reference
+field_mapping
+indicator-zhuoyao
+indicator-bias-signal
+```

docs/readme.md

@@ -0,0 +1,5 @@
+# easy-tdx
+
+```{include} ../README.md
+:relative-images:
+```

docs/requirements.txt

@@ -0,0 +1,4 @@
+sphinx>=7.0
+sphinx-autobuild>=2024.0
+myst-parser>=3.0
+sphinx-rtd-theme>=2.0