feat(docs): writing getting started and answering a challenge

docs/src/content/docs/guides/resolve-challenge.md

@@ -0,0 +1,37 @@
+---
+title: Resolve a Challenge
+description: Guide to resolve a challenge
+---
+
+In this guide, you will learn how to resolve a challenge and submit an answer to the main Github repository.
+
+## Presentation
+
+This repository is powered by [Nx](https://nx.dev/getting-started/intro). **Nx** is a monorepository allowing to store multiple application inside the same workspace. That's said, each challenges is a separate application. If you open the `apps` directory, you will found multiple directory all related to one challenge. Each directory is a complete standalone `Nx` application. To run and start with one, open your terminal and run
+
+```bash
+npx nx serve <APPLICATION_NAME>
+```
+
+:::note
+If you are not sure of your APPLICATION_NAME, open the README.md file. The `serve` command is written inside with a link to the documentation challenge.
+:::
+
+:::note
+If `nx` is installed globally on your device, you can avoid using `npx`.
+
+If you want to install `nx` globally, run
+
+```bash
+npm i -g nx
+```
+
+:::
+
+## Create a git branch
+
+Before starting implementing your own solution to resolve a challenge, create a git branch to save your work.
+
+```bash
+git checkout -b <BRANCH_NAME>
+```