Added generated png files

Signed-off-by: Gonzalo de Pedro <[email protected]>

source/Concepts/Advanced/About-Internal-Interfaces.rst

@@ -215,7 +215,7 @@ On workspace build, the *generator* packages, registers portions of CMake code a
 
 Hook registration on CodeGenerator project build
 
-.. figure:: ../images/code_generator.svg
+.. figure:: ../images/code_generator.png
    :alt: code generator sequence diagram
 
    Figure: sequence diagram of "code generator" interaction with CMake extensions.
@@ -225,7 +225,7 @@ When the *client* package, during its build process, calls the 'rosidl_generate_
 After collecting all the arguments files, the extension calls the template engine for all the arguments files at once. Once code is generated,
 the 'rosidl_generate_idl_interfaces' extensiones are called to get code added to an artifact (a library) and export dependiences.
 
-.. figure:: ../images/generator_client.svg
+.. figure:: ../images/generator_client.png
    :alt: generator client sequence diagram
 
    Figure: sequence diagram of "generator client" interaction with CMake extensions.

source/Concepts/images/code_generator.mmd

@@ -0,0 +1,9 @@
+sequenceDiagram
+    participant CodeGenerator_cmake
+    participant ament_package
+    participant ament_register_extension
+    CodeGenerator_cmake->>ament_package: CONFIG_EXTRAS
+    ament_package->>ament_register_extension: rosidl_create_type_descriptions_extensions, cmake_code_hook
+    ament_package->>ament_register_extension: rosidl_write_generator_arguments_extensions, cmake_code_hook
+    ament_package->>ament_register_extension: rosidl_generate_idl_interfaces, cmake_code_hook
+    Note right of ament_package: Execute a cmake.in template with variables and a cmake code hook.

source/Concepts/images/generator_client.mmd

@@ -18,7 +18,7 @@ sequenceDiagram
         deactivate generate_arguments_file
         rosidl_write_generator_arguments_extensions_HOOK->>rosidl_generate_interfaces: arguments_file
     end
-    rosidl_generate_interfaces>>rosidl_generator: [arguments_files]
+    rosidl_generate_interfaces->>rosidl_generator: [arguments_files]
     loop ForEach rosidl_generate_idl_interfaces Hook
         rosidl_generate_interfaces->>rosidl_generate_idl_interfaces_HOOK: generated_files
     end