Add MAVLink headers with generator script

README.md

@@ -4,19 +4,36 @@ Named in this order so not everything starts with the same word
 
 ## Development
 
-Using Godot v4.4.beta1.official [d33da79d3].
-Install SCons with `pipx install scons`.
-
-To generate files for build tooling, run the following:
+This repository uses [Git Submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules), to get all the code you need to run either:
 
 ```sh
-godot --dump-extension-api
-scons compile_commands
+git clone --recurse-submodules <address of this repository>
+# Or at any later point
+git submodule update --init --recursive
+```
+
+Using Godot v4.4.beta1.official [d33da79d3](https://github.com/godotengine/godot/commit/d33da79d3f8fe84be2521d25b9ba8e440cf25a88).
+Install SCons with `pipx install scons`.
+For updating MAVLink generator, you additionally `pip install future`.
+It is recommended to install any packages in a [virtual environment](https://docs.python.org/3/library/venv.html), for example:
+
+```sh
+python3 -m venv venv
+source venv/bin/activate
+pip install future
+```
+
+Some files are generated, run the following commands on first setup and when dependencies change:
+
+```sh
+godot --dump-extension-api  # after updating Godot
+scons compile_commands      # after modifying SConstruct
+python update_mavlink.py    # after updating MAVLink dialect
 ```
 
 ### Build
 
-To build the extension run SCons in the repository root, the default arguments have been added to the file.
+To build the GDExtension binary run SCons in the repository root, the default arguments have been added to the file.
 
 ```sh
 scons