Update README.md

README.md

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-# Rigidbody First Person Controller
+# Unity Rigidbody First Person Controller
+
+**Setup :**
+
+  - In the Unity's Package Manager, go in the Unity Registry and search for "Input System"
+  - Import the package and follow the instructions
+  - Download the unity package in the release section
+  - In your Project "Assets" Folder, right click, select "Import Package" -> "Custom Package..."
+  - Import all the assets
+  - In the new "FirstPersonController" Folder you can find the "PlayerContainer" Prefab, place it in your scene
+
+**Notes :**
+
+  - In the "FirstPersonController" Folder of the Package, you can find the "PlayerInputActions" Action Map to edit the keybinds
+  - Scripts and variables may not be commented and documented enough so I'll let you play with it!