Update README.md

Author: Antoine Lelievre

README.md

@@ -48,6 +48,8 @@ The current Unity version used for the project is **2020.2.0f1**, if you want to
 
 ## Installation
 
+<details><summary>Instructions</summary>
+
 ### Install Manually
 There are two ways to install this asset: you can use the Unity package manager or move the entire repo inside your Assets folder.
 To install using the package manager:
@@ -71,6 +73,13 @@ Alternatively, you can use the [git address feature in the package manager](http
 
 Note that you'll not have access to the examples provided in this repo because the package only include the core of NodeGraphProcessor.
 
+</details>
+
+
+## Community 
+
+Join the [NodeGraphProcessor Discord server](https://discord.gg/XuMd3Z5Rym)! 
+
 ## Features
 
 - Node and Graph property serialization (as json)