Add personas and extended user stories for feature 001

doc/feature_001.mkdn

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+# Features
+
+## Personas
+
+- **Alice** : Nouvelle utilisatrice souhaitant rejoindre la plateforme pour discuter avec ses amis.
+- **Bob** : Utilisateur régulier, membre de plusieurs salons, aime organiser des conversations de groupe.
+- **Claire** : Administratrice, responsable de la gestion des rôles et des permissions.
+- **David** : Utilisateur invité, découvre la plateforme via une invitation à un salon.
+
+## User Registration
+**Persona:** Alice
+**Scenario:** User registers into the application
+- Given Alice is on the registration page
+- When she provides valid details (username, email, password)
+- And she clicks "Register"
+- Then the username, email and password are validated by the system
+- And her account is created
+- And she receives a confirmation message
+- And she is redirected to the login page
+- And she receives a welcome email
+- When she tries to register with an existing email
+- Then the system displays an error message
+
+## User Login
+**Persona:** Alice
+**Scenario:** User logs into the application
+- Given Alice is on the login page
+- When she enters valid credentials (email/username and password)
+- And she clicks "Login"
+- Then the credentials are validated by the system
+- And she is granted access to the application
+- When she enters an invalid password
+- Then the system displays an error message
+
+## Role Management
+**Persona:** Claire
+**Scenario:** Admin creates and assigns roles
+- Given Claire is logged in as an admin
+- When she navigates to the roles management page
+- And she creates a new role or edits an existing one
+- Then the role is saved
+- And she can assign or unassign it to the users
+- When she tries to assign a role to herself
+- Then the system prevents self-assignment for certain roles (e.g., SuperAdmin)
+- When she deletes a role
+- Then the system asks for confirmation and updates all affected users
+
+## Permission Management
+**Persona:** Claire
+**Scenario:** Admin manages permissions for roles
+- Given Claire is logged in as an admin
+- When she navigates to the permissions management page
+- And she assigns or removes permissions for a role
+- Then the permissions are updated
+- And users with that role have the correct accesses
+
+## Send a Message
+**Persona:** Bob
+**Scenario:** User sends a message in a conversation
+- Given Bob is logged in
+- And he is in an existing conversation with other users
+- When he types a message
+- And he clicks "Send"
+- Then the message appears in the conversation for all participants
+- When he sends an empty message
+- Then the system prevents sending and shows a warning
+- When he sends a message with an attachment
+- Then the attachment is uploaded and visible to all participants
+
+## Read Messages
+**Persona:** Alice
+**Scenario:** User reads messages in a conversation
+- Given Alice is logged in
+- And she has joined a conversation
+- When another user sends a message
+- Then the message appears in the conversation in real time
+- When she scrolls up, older messages are loaded
+
+## Create a Conversation
+**Persona:** Bob
+**Scenario:** User creates a conversation with one or more users
+- Given Bob is logged in
+- When he clicks "New Conversation"
+- And he selects one or more users
+- And he clicks "Create"
+- Then a new conversation is created
+- And the selected users are added to the conversation
+- When he tries to create a conversation with himself only
+- Then the system prevents it and shows a message
+
+## Salon Creation
+**Persona:** Bob
+**Scenario:** User creates a new salon
+- Given Bob is logged in
+- When he navigates to the "Create Salon" page
+- And he provides a salon name
+- And he clicks "Create"
+- Then a new salon is created
+- And Bob is added as a member of the salon
+- When he tries to create a salon with a name that already exists
+- Then the system displays an error message
+
+## Invite Users to a Salon
+**Persona:** Bob, David
+**Scenario:** User invites others to join a salon
+- Given Bob is logged in
+- And he is a member of an existing salon
+- When he selects other users to invite (including David)
+- And he clicks "Invite"
+- Then the selected users receive an invitation
+- And they can join the salon once they accept
+- When David accepts the invitation
+- Then he becomes a member of the salon