Add setup and usage pages

website/content/usage/index.md

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+title = "Usage"
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+
+<!-- toc -->
+
+## Doing exercises
+
+The exercises are sorted by topic and can be found in the subdirectory `exercises/<topic>`.
+For every topic, there is an additional `README.md` file with some resources to get you started on the topic.
+We highly recommend that you have a look at them before you start 📚️
+
+Most exercises contain an error that keeps them from compiling, and it's up to you to fix it!
+Some exercises contain tests that need to pass for the exercise to be done ✅
+
+Search for `TODO` and `todo!()` to find out what you need to change.
+Ask for hints by entering `h` in the _watch mode_ 💡
+
+### Watch Mode
+
+After the [initialization](@/setup/index.md#initialization), Rustlings can be launched by simply running the command `rustlings`.
+
+This will start the _watch mode_ which walks you through the exercises in a predefined order (what we think is best for newcomers).
+It will rerun the current exercise automatically every time you change the exercise's file in the `exercises/` directory.
+
+<details>
+<summary><strong>If detecting file changes in the <code>exercises/</code> directory fails…</strong> (<em>click to expand</em>)</summary>
+
+> You can add the **`--manual-run`** flag (`rustlings --manual-run`) to manually rerun the current exercise by entering `r` in the watch mode.
+>
+> Please [report the issue](https://github.com/rust-lang/rustlings/issues/new) with some information about your operating system and whether you run Rustlings in a container or virtual machine (e.g. WSL).
+
+</details>
+
+### Exercise List
+
+In the [watch mode](#watch-mode) (after launching `rustlings`), you can enter `l` to open the interactive exercise list.
+
+The list allows you to…
+
+- See the status of all exercises (done or pending)
+- `c`: Continue at another exercise (temporarily skip some exercises or go back to a previous one)
+- `r`: Reset status and file of the selected exercise (you need to _reload/reopen_ its file in your editor afterwards)
+
+See the footer of the list for all possible keys.
+
+## Questions?
+
+If you need any help while doing the exercises and the builtin-hints aren't helpful, feel free to ask in the [_Q&A_ category of the discussions](https://github.com/rust-lang/rustlings/discussions/categories/q-a?discussions_q=) if your question wasn't asked yet 💡
+
+## Continuing On
+
+Once you've completed Rustlings, put your new knowledge to good use!
+Continue practicing your Rust skills by building your own projects, contributing to Rustlings, or finding other open-source projects to contribute to.
+
+## Uninstalling Rustlings
+
+If you want to remove Rustlings from your system, run the following command:
+
+```bash
+cargo uninstall rustlings
+```