add js memory tutorial (#2421)

docs/tutorial/node/src/getting_started.md

@@ -0,0 +1,46 @@
+# Getting Started
+
+In this tutorial, we use JavaScript as the host programming language. We also support other programming languages like
+[Rust](https://slint-ui.com/docs/rust/slint/) or [C++](https://slint-ui.com/docs/cpp/).
+
+You'll need a development environment with [Node.js 16](https://nodejs.org/download/release/v16.19.1/) and [npm](https://www.npmjs.com/) installed. More recent
+versions of NodeJS are currently not supported, for details check [Issue #2220](https://github.com/slint-ui/slint/issues/2220).
+Since Slint is implemented in the Rust programming language, you also need to install a Rust compiler (1.66 or newer). You can easily install a Rust compiler
+following the instruction from [the Rust website](https://www.rust-lang.org/learn/get-started).
+
+We're going to use `slint-ui` as `npm` dependency.
+
+In a new directory, we create a new `package.json` file.
+
+```json
+{{#include package.json}}
+```
+
+This should look familiar to people familiar with NodeJS. We see that this package.json
+references a `main.js`, which we will add later. We must then create, in the same directory,
+the `memory.slint` file. Let's just fill it with a hello world for now:
+
+```slint
+{{#include memory.slint:main_window}}
+```
+
+What's still missing is the `main.js`:
+
+```js
+{{#include main_initial.js:main}}
+```
+
+To recap, we now have a directory with a `package.json`, `memory.slint`, and `main.js`.
+
+We can now compile and run the program:
+
+```sh
+npm install
+npm start
+```
+
+and a window will appear with the green "Hello World" greeting.
+
+![Screenshot of initial tutorial app showing Hello World](https://slint-ui.com/blog/memory-game-tutorial/getting-started.png "Hello World")
+
+Feel free to use your favorite IDE for this purpose.