Build basic sphinx doctree for doc/fluid

doc/CMakeLists.txt

 add_subdirectory(v2)
+add_subdirectory(fluid)

doc/fluid/CMakeLists.txt

+if(NOT DEFINED SPHINX_THEME)
+    set(SPHINX_THEME default)
+endif()
+
+if(NOT DEFINED SPHINX_THEME_DIR)
+    set(SPHINX_THEME_DIR)
+endif()
+
+# configured documentation tools and intermediate build results
+set(BINARY_BUILD_DIR_EN "${CMAKE_CURRENT_BINARY_DIR}/en/_build")
+
+# Sphinx cache with pickled ReST documents
+set(SPHINX_CACHE_DIR_EN "${CMAKE_CURRENT_BINARY_DIR}/en/_doctrees")
+
+# HTML output director
+set(SPHINX_HTML_DIR_EN "${CMAKE_CURRENT_BINARY_DIR}/en/html")
+
+configure_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/../templates/conf.py.en.in"
+    "${BINARY_BUILD_DIR_EN}/conf.py"
+    @ONLY)
+
+sphinx_add_target(paddle_fluid_docs
+                  html
+                  ${BINARY_BUILD_DIR_EN}
+                  ${SPHINX_CACHE_DIR_EN}
+                  ${CMAKE_CURRENT_SOURCE_DIR}
+                  ${SPHINX_HTML_DIR_EN})
+
+# configured documentation tools and intermediate build results
+set(BINARY_BUILD_DIR_CN "${CMAKE_CURRENT_BINARY_DIR}/cn/_build")
+
+# Sphinx cache with pickled ReST documents
+set(SPHINX_CACHE_DIR_CN "${CMAKE_CURRENT_BINARY_DIR}/cn/_doctrees")
+
+# HTML output directory
+set(SPHINX_HTML_DIR_CN "${CMAKE_CURRENT_BINARY_DIR}/cn/html")
+
+configure_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/../templates/conf.py.cn.in"
+    "${BINARY_BUILD_DIR_CN}/conf.py"
+    @ONLY)
+
+sphinx_add_target(paddle_fluid_docs_cn
+                  html
+                  ${BINARY_BUILD_DIR_CN}
+                  ${SPHINX_CACHE_DIR_CN}
+                  ${CMAKE_CURRENT_SOURCE_DIR}
+                  ${SPHINX_HTML_DIR_CN})

doc/fluid/build_and_install/index_cn.rst

+安装与使用
+------------

doc/fluid/build_and_install/index_en.rst

+Build and Install
+------------

doc/fluid/design/index_cn.rst

+设计思想
+------------

doc/fluid/design/index_en.rst

+Design
+------------

doc/fluid/dev/index_cn.rst

+开发标准
+------------

doc/fluid/dev/index_en.rst

+Development
+------------
+
+This is Development page

doc/fluid/faq/index_cn.rst

+FAQ
+------------

doc/fluid/faq/index_en.rst

+FAQ
+------------

doc/fluid/getstarted/index_cn.rst

+新手入门
+------------
+
+新手入门

doc/fluid/getstarted/index_en.rst

+GET STARTED
+------------
+
+This is get started page

doc/fluid/howto/index_cn.rst

+进阶使用
+------------

doc/fluid/howto/index_en.rst

+HOW TO
+------------
+
+This is how to page

doc/fluid/index_cn.rst

+ PaddlePaddle Fluid
+==========================
+
+..  toctree::
+  :maxdepth: 1
+
+  getstarted/index_cn.rst
+  design/index_cn.rst
+  build_and_install/index_cn.rst
+  howto/index_cn.rst
+  dev/index_cn.rst
+  faq/index_cn.rst

doc/fluid/index_en.rst

+ PaddlePaddle Fluid
+==========================
+
+..  toctree::
+  :maxdepth: 1
+
+  getstarted/index_en.rst
+  design/index_en.rst
+  build_and_install/index_en.rst
+  howto/index_en.rst
+  dev/index_en.rst
+  faq/index_en.rst