Added generated class diagram.

.clang-uml

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+compilation_database_dir: ./build
+output_directory: ./docs/diagrams
+diagrams:
+  boost_asio:
+    type: class
+    generate_method_arguments: none
+    include_relations_also_as_members: false
+    glob:
+      - example/cpp11/http/server/server.cpp
+    using_namespace:
+      - boost::asio
+    include:
+      namespaces:
+        - boost::asio
+    exclude:
+      namespaces:
+        - http::server
+        - std
+        - boost::asio::detail
+        - boost::asio::buffer_literals::detail
+        - boost::asio::execution::detail
+        - boost::asio::experimental::detail
+        - boost::asio::impl
+        - boost::asio::executor::impl
+        - boost::asio::ip::detail
+        - boost::asio::posix
+        - boost::asio::traits
+        - boost::beast
+        - boost::redis
+      elements:
+        - boost::asio::associator
+        - boost::asio::async_result
+        - boost::asio::deferred_init_tag
+        - boost::asio::is_deferred
+        - boost::asio::traits::static_query
+        - boost::asio::is_applicable_property
+
+      # Excluding these specializations unfortunately results in a crash of clang-uml
+      # specializations:
+        # - boost::asio::associator<T1>
+        # - boost::asio::associator<T1,T2>
+        # - boost::asio::asyncresult<T1>
+        # - boost::asio::asyncresult<T1,T2>
+        # - boost::asio::is_deferred<T1>
+        # - boost::asio::is_deferred<T1,T2>
+      access:
+        - private
+    plantuml:
+      before:
+        - 'title Class Diagram for boost asio'
+

create_class_diagram.sh

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+# Expects the BOOST_ROOT environment variable to be set.
+
+# Get and build clang-uml: https://github.com/bkryza/clang-uml
+# Expects the CLANG_UML environment variable to be set, containing the path to the clang-uml executable
+
+# Example:
+# BOOST_ROOT=~/projects/boost CLANG_UML=~/projects/clang-uml/build/clang-uml ./create_class_diagram.sh
+
+mkdir -p example/cpp11/http/server/build
+pushd example/cpp11/http/server/build
+cmake .. -DCMAKE_EXPORT_COMPILE_COMMANDS=1
+make -j4
+popd
+
+${CLANG_UML} -c .clang-uml -d example/cpp11/http/server/build/compile_commands.json -o ./doc
+
+# Install plantuml & use it to convert to image format
+# sudo apt install plantuml
+plantuml ./doc/boost_asio.puml -tsvg