Add feature_001 documentation

doc/feature_001.mkdn

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+# Features
+
+## User Registration
+**Scenario:** User registers into the application
+- Given a new user is on the registration page
+- When they provide valid details (username, email, password)
+- And they click "Register"
+- Then the username, email and password are validated by the system
+- And their account is created
+- And they receive a confirmation message
+
+## User Login
+**Scenario:** User logs into the application
+- Given a registered user is on the login page
+- When they enter valid credentials (email/username and password)
+- And they click "Login"
+- Then the credentials are validated by the system
+- And they are granted access to the application
+
+## Role Management
+**Scenario:** Admin creates and assigns roles
+- Given an admin is logged in
+- When they navigate to the roles management page
+- And they create a new role or edit an existing one
+- Then the role is saved
+- And they can assign or unassign it to the users
+
+## Permission Management
+**Scenario:** Admin manages permissions for roles
+- Given an admin is logged in
+- When they navigate to the permissions management page
+- And they assign or remove permissions for a role
+- Then the permissions are updated
+- And users with that role have the correct accesses
+
+## Send a Message
+**Scenario:** User sends a message in a conversation
+- Given a user is logged in
+- And they are in an existing conversation with other users
+- When they type a message
+- And they click "Send"
+- Then the message appears in the conversation for all participants
+
+## Read Messages
+**Scenario:** User reads messages in a conversation
+- Given a user is logged in
+- And they have joined a conversation
+- When another user sends a message
+- Then the message appears in the conversation in real time
+
+## Create a Conversation
+**Scenario:** User creates a conversation with one or more users
+- Given a user is logged in
+- When they click "New Conversation"
+- And they select one or more users
+- And they click "Create"
+- Then a new conversation is created
+- And the selected users are added to the conversation
+
+## Salon Creation
+**Scenario:** User creates a new salon
+- Given a user is logged in
+- When they navigate to the "Create Salon" page
+- And they provide a salon name
+- And they click "Create"
+- Then a new salon is created
+- And the user is added as a member of the salon
+
+## Invite Users to a Salon
+**Scenario:** User invites others to join a salon
+- Given a user is logged in
+- And they are a member of an existing salon
+- When they select other users to invite
+- And they click "Invite"
+- Then the selected users receive an invitation
+- And they can join the salon once they accept