docs(introduction): fix typo

subjects/introduction/README.md

@@ -28,7 +28,7 @@ This command needs to be adapted with **your own username**.
 
 #### 2- set
 
-Once the repository is created, use you code editor to write your first shell script called `hello.sh`
+Once the repository is created, use your code editor to write your first shell script called `hello.sh`
 
 When executed, this script must print `Hello choumi!`, where `choumi` is your username.