Consolidate language tutorials (#5037)

All the language tutorials are merged into the Slint reference as "quick starts".

docs/reference/src/quickstart/getting_started.md

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+<!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
+
+# Getting started
+
+This tutorial shows you how to use the languages Slint supports as the host programming language.
+
+We recommend using [our editor integrations for Slint](https://github.com/slint-ui/slint/tree/master/editors) for following this tutorial.
+
+Slint has application templates you can use to create a project with dependencies already set up that follows recommended best practices.
+
+## Prerequisites
+
+:::::{tab-set}
+
+::::{tab-item} C++
+:sync: cpp
+
+Before using the template, you need a C++ compiler that supports C++ 20 and to install [CMake](https://cmake.org/download/) 3.21 or newer.
+
+Clone or download the template repository:
+
+```sh
+git clone https://github.com/slint-ui/slint-cpp-template memory
+cd memory
+```
+
+### Configure the project
+
+The `CMakeLists.txt` uses the line `add_executable(my_application src/main.cpp)` to set `src/main.cpp` as the main C++ code file.
+
+Change the content of `src/main.cpp` to the following:
+
+:::{literalinclude} main_initial.cpp
+:lines: 9-13
+:::
+
+Also in `CMakeLists.txt` the line
+`slint_target_sources(my_application ui/appwindow.slint)` is a Slint function used to
+add the `appwindow.slint` file to the target.
+
+Change the contents of `ui/appwindow.slint` to the following:
+
+:::{literalinclude} appwindow.slint
+:language: slint,no-preview
+:lines: 6-11
+:::
+
+Configure with CMake:
+
+```sh
+cmake -B build
+```
+
+:::{tip}
+When configuring with CMake, the FetchContent module fetches the source code of Slint via git.
+This may take some time when building for the first time, as the process needs to build
+the Slint runtime and compiler.
+:::
+
+Build with CMake:
+
+```sh
+cmake --build build
+```
+
+### Run the application
+
+Run the application binary on Linux or macOS:
+
+```sh
+./build/my_application
+```
+
+Or on Windows:
+
+```sh
+build\my_application.exe
+```
+
+This opens a window with a green "Hello World" greeting.
+
+If you are stepping through this tutorial on a Windows machine, you can run the application at each step with:
+
+```sh
+my_application
+```
+
+::::
+
+::::{tab-item} NodeJS
+:sync: nodejs
+
+Clone the template with the following command:
+
+```sh
+git clone https://github.com/slint-ui/slint-nodejs-template memory
+cd memory
+```
+
+Install dependencies with npm:
+
+```sh
+npm install
+```
+
+### Configure the project
+
+The `package.json` file references `src/main.js` as the entry point for the application and `src/main.js` references `memory.slint` as the UI file.
+
+Replace the contents of `src/main.js` with the following:
+
+:::{literalinclude} main_initial.js
+:lines: 6-10
+:::
+
+The `slint.loadFile` method resolves files from the process's current working directory, so from the `package.json` file's location.
+
+Replace the contents of `ui/appwindow.slint` with the following:
+
+:::{literalinclude} memory.slint
+:language: slint,no-preview
+:lines: 6-11
+:::
+
+### Run the application
+
+Run the example with `npm start` and a window appears with the green "Hello World" greeting.
+
+::::
+
+::::{tab-item} Rust
+:sync: rust
+
+We recommend using [rust-analyzer](https://rust-analyzer.github.io) and [our editor integrations for Slint](https://github.com/slint-ui/slint/tree/master/editors) for following this tutorial.
+
+Slint has an application template you can use to create a project with dependencies already set up that follows recommended best practices.
+
+Before using the template, install [`cargo-generate`](https://github.com/cargo-generate/cargo-generate):
+
+```sh
+cargo install cargo-generate
+```
+
+Use the template to create a new project with the following command:
+
+```sh
+cargo generate --git https://github.com/slint-ui/slint-rust-template --name memory
+cd memory
+```
+
+### Configure the project
+
+Replace the contents of `src/main.rs` with the following:
+
+:::{literalinclude} main_initial.rs
+:lines: 6-17
+:::
+
+### Run the application
+
+Run the example with `cargo run` and a window appears with the green "Hello World" greeting.
+
+::::
+
+:::::
+
+![Screenshot of initial tutorial app showing Hello World](https://slint.dev/blog/memory-game-tutorial/getting-started.png "Hello World")