Add language support and configuration in documentation

- Introduced dynamic language selection in `conf.py` based on environment variable.
- Set up separate README files for English and Chinese builds.
- Updated `html_context` to include language pairs and current language settings for better localization support.

Author: adamzhang1987

docs/source/conf.py

@@ -24,6 +24,25 @@
 # The full version, including alpha/beta/rc tags
 release = '1.0.1'
 
+# The language for content autogenerated by Sphinx
+language = os.environ.get('SPHINX_LANGUAGE', 'en')  # Default to English if not specified
+
+# Choose the appropriate README file based on language
+if language == 'zh_CN':
+    # Use Chinese README for Chinese builds
+    master_doc = 'README_CN'
+else:
+    # Use English README for all other languages (including default English)
+    master_doc = 'README'
+
+# List of supported languages
+languages = ['en', 'zh_CN']
+
+# Language to use in text generated by Sphinx
+language_pairs = {
+    'en': 'English',
+    'zh_CN': '简体中文',
+}
 
 # -- General configuration ---------------------------------------------------
 
@@ -60,12 +79,11 @@
 
 # -- Options for ReadTheDocs ------------------------------------------------
 
-# ReadTheDocs specific settings
+# Optional: Language selector HTML context (if you want to add a language switcher)
 html_context = {
     'display_language_tabs': True,
     'current_language': 'en',
-    'languages': {
-        'en': 'English',
-        'zh_CN': '中文',
-    },
-}
+    'languages': languages,
+    'language_pairs': language_pairs,
+    'current_language': language,
+}