Add CMake documentation

docs/godot/cmake.md

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+---
+sidebar_position: 10
+---
+
+# CMake Projects
+
+It's possible to use complex projects with dependencies while scripting with C++ in Godot.
+
+This method requires a local RISC-V compiler installed on your system. If you don't have that, you won't be able to use CMake locally.
+
+## Installation
+
+On Linux and Windows WSL2 we can install a C++ RISC-V compiler like so:
+
+```sh
+sudo apt install g++-14-riscv64-linux-gnu
+```
+
+On some system you may only have access to version 12 or 13. Modify the `build.sh` below accordingly.
+
+On macOS there are RISC-V toolchains in brew. Let us know which ones worked for you.
+
+## Usage
+
+There is a [CMake project in the Godot Sandbox](https://github.com/libriscv/godot-sandbox/tree/main/program/cpp/cmake) repository that can be used to create ELFs with the API pre-included.
+
+The easiest way to access it is to create a symlink to the cmake folder above in your project so that you can directly reference it in CMake:
+
+```cmake
+cmake_minimum_required(VERSION 3.10)
+project(example LANGUAGES CXX)
+
+# Add the Godot Sandbox build functions
+add_subdirectory(cmake)
+
+add_sandbox_program(example
+    example.cpp
+)
+```
+
+Here `example` is a regular CMake target that you can use like normal. You can have as many programs as you want.
+
+In order to build this project, we will use a simple build script:
+
+```sh
+#!/bin/bash
+
+# Change this to reflect your RISC-V toolchain
+# ccache is optional, but recommended
+export CXX="ccache riscv64-linux-gnu-g++-14"
+
+# Create build directory
+mkdir -p .build
+pushd .build
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=../toolchain.cmake
+make -j4
+popd
+```
+
+Remember to make the script executable:
+
+```sh
+chmod +x build.sh
+```
+
+And, if we want to automatically build every time we change a file:
+
+```sh
+#!/bin/sh
+set -e -u
+
+FPATH="$PWD"
+PATTERN="\.cpp$"
+COMMAND="./build.sh"
+
+inotifywait -q --format '%f' -m -r -e close_write $FPATH \
+    | grep --line-buffered $PATTERN \
+    | xargs -I{} -r sh -c "echo [\$(date -Is)] $COMMAND && $COMMAND"
+```
+
+If we now run `autobuild.sh` in a terminal window, it will automatically build our programs every time we change a file.

docs/godot/cppapi.md

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+sidebar_position: 11
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 # C++ API Reference