chore: extend contributing docs

docs/docs/contributing-started.mdx

@@ -7,7 +7,7 @@ sidebar_label: Get Started
 import Tabs from "@theme/Tabs";
 import TabItem from "@theme/TabItem";
 
-## Getting started
+## Install dependencies
 
 ### go
 
@@ -63,6 +63,17 @@ Make sure to remove this before submitting a PR as there's [a check][pr-go-mod]
 </TabItem>
 </Tabs>
 
+## Get the source code
+
+The source is hosted on [Github][omp]. When you want to contribute, create a [fork][gh-fork] so you can make changes in your repository
+and create pull request in the official Oh my Posh repository.
+
+Clone your fork of Oh my Posh locally, replace `<user>` with your Github username.
+
+```bash
+git clone git@github.com:<user>/oh-my-posh3.git
+```
+
 ## Running tests
 
 Before doing anything else, we need to pack the initialization scripts into the source.
@@ -108,3 +119,5 @@ With everything set up, you're ready to start making changes and create your fir
 [go-global]: https://github.com/golang/go/issues/40276
 [pr-go-mod]: https://github.com/JanDeDobbeleer/oh-my-posh3/blob/main/.github/workflows/gomod.yml
 [gh-pr]: https://github.com/JanDeDobbeleer/oh-my-posh3/pulls
+[omp]: https://github.com/JanDeDobbeleer/oh-my-posh3
+[gh-fork]: https://guides.github.com/activities/forking/