chore: contributing notes

Author: posva

.github/CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 Contributions are welcome and will be fully credited!
 
-We accept contributions via Pull Requests on [Github](https://github.com/{{ githubAccount }}/{{ name }}).
+We accept contributions via Pull Requests on [Github](<https://github.com/>{{ githubAccount }}/{{ name }}).
 
 ## Setup
 
@@ -19,3 +19,17 @@ Here are some guidelines to make the process smoother:
 - **One pull request per feature** - If you want to do more than one thing, send multiple pull requests.
 - **Send coherent history** - Make sure your commits message means something
 - **Consider our release cycle** - We try to follow [SemVer v2.0.0](http://semver.org/). Randomly breaking public APIs is not an option.
+
+## Project structure
+
+### Root
+
+The root folder includes the VueFire library
+
+### `packages/nuxt`
+
+This folder includes the Nuxt module. To have proper TS support in your IDE, you might need to open this folder individually rather than opening the root folder of the VueFire project.
+
+### `playground`
+
+Includes a Vue 3 playground to test out with a real app.