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Add a guide for third-party exercises

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## Continuing On
<!-- TODO: Mention third-party exercises -->
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.
## Third-Party Exercises
Do you want to create your own set of Rustlings exercises to focus on some specific topic?
Or did you want to translate the original Rustlings exercises?
Then follow the link to the guide about [third-party exercises](THIRD_PARTY_EXERCISES.md)!
## Uninstalling Rustlings
If you want to remove Rustlings from your system, run the following command:

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# Third-Party Exercises
The support of Rustlings for third-party exercises allows you to create your own set of Rustlings exercises to focus on some specific topic.
You could also offer a translatation of the original Rustlings exercises as a third-party exercises.
## Getting started
To create third-party exercises, install Rustlings and run `rustlings dev new PROJECT_NAME`.
This command will, similar to `cargo new PROJECT_NAME`, create a template directory called `PROJECT_NAME` with all what you need to get started.
Read the comments in the generated `info.toml` file to understand the format of this file.
It allows you to set a custom welcome and final message and specify the metadata of every exercise.
## Create an exercise
Here is an example of the metadata of one file:
```toml
[[exercises]]
name = "intro1"
hint = """
To finish this exercise, you need to …
This link might help you …"""
```
After entering this in `info.toml`, create the file `intro1.rs` in the `exercises/` directory.
The exercise needs to contain a `main` function, but it can be empty.
Adding tests is recommended.
Look at the official Rustlings exercises for inspiration.
You can optionally add a solution file `intro1.rs` to the `solutions/` directory.
Now, run `rustlings dev check`.
It will tell you about any issues with your exercises.
For example, it will tell you to run `rustlings dev update` to update the `Cargo.toml` file to include the new exercise `intro1`.
`rustlings dev check` will also run your solutions (if you have any) to make sure that they run successfully.
That's it!
You finished your first exercise 🎉
## Publish
Now, add more exercises and publish them as a Git repository.
Users just have to clone that repository and run `rustlings` in it to start working on your set of exercises just like the official ones.
One difference to the official exercises is that the solution files will not be hidden until the user finishes an exercise.
But you can trust the user to not look at the solution too early ;)
## Share
After publishing your set of exercises, open a pull request in the official Rustlings repository to link to your project in the README 😃