diff --git a/bin/crm.exe b/bin/crm.exe
new file mode 100644
index 0000000..994fd2e
Binary files /dev/null and b/bin/crm.exe differ
diff --git a/cmd/crm/main.go b/cmd/crm/main.go
new file mode 100644
index 0000000..e1ec176
--- /dev/null
+++ b/cmd/crm/main.go
@@ -0,0 +1,11 @@
+package main
+
+import (
+	"github.com/armanceau/mini-crm/internal/app"
+	"github.com/armanceau/mini-crm/internal/storage"
+)
+
+func main() {
+	var store storage.Storer = storage.NewJsonStore("./")
+	app.Run(store)
+}
diff --git a/internal/app/app.go b/internal/app/app.go
new file mode 100644
index 0000000..831b6dd
--- /dev/null
+++ b/internal/app/app.go
@@ -0,0 +1,143 @@
+package app
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/armanceau/mini-crm/internal/storage"
+)
+
+func Run(store storage.Storer) {
+	nomFlag := flag.String("nom", "", "Nom du contact à ajouter")
+	emailFlag := flag.String("email", "", "Email du contact à ajouter")
+
+	flag.Parse()
+	if *nomFlag != "" && *emailFlag != "" {
+		contact := storage.Contact{
+			Nom:   strings.TrimSpace(*nomFlag),
+			Email: strings.TrimSpace(*emailFlag),
+		}
+		c := store.Ajouter(contact)
+		fmt.Println("Contact ajouté via flag :", c.ID, c.Nom, c.Email)
+		return
+	}
+	menu(store)
+}
+
+func menu(store storage.Storer) {
+	reader := bufio.NewReader(os.Stdin)
+
+	for {
+		fmt.Println("\n--- cli contact ---")
+		fmt.Println("1. Ajouter un contact")
+		fmt.Println("2. Liste des contacts")
+		fmt.Println("3. Supprimer un contact")
+		fmt.Println("4. Mettre à jour un contact")
+		fmt.Println("5. Quitter")
+		input, _ := reader.ReadString('\n')
+		choix := strings.TrimSpace(input)
+
+		switch choix {
+		case "1":
+			ajouterContact(reader, store)
+		case "2":
+			listeContacts(store)
+		case "3":
+			supprimerContact(reader, store)
+		case "4":
+			mettreAJourContact(reader, store)
+		case "5":
+			fmt.Println("À bientôt 👋")
+			return
+		default:
+			fmt.Println("Choix invalide")
+		}
+	}
+
+}
+
+func New(ID int, Nom string, Email string) storage.Contact {
+	contact := storage.Contact{ID: ID, Nom: Nom, Email: Email}
+	return contact
+}
+
+func ajouterContact(reader *bufio.Reader, store storage.Storer) {
+	fmt.Print("Nom : ")
+	nom, _ := reader.ReadString('\n')
+	fmt.Print("Email : ")
+	email, _ := reader.ReadString('\n')
+
+	contact := storage.Contact{
+		Nom:   strings.TrimSpace(nom),
+		Email: strings.TrimSpace(email),
+	}
+
+	c := store.Ajouter(contact)
+	fmt.Println("Contact ajouté ✅ :", c.ID, c.Nom, c.Email)
+}
+
+func listeContacts(store storage.Storer) {
+	contacts := store.Lister()
+	if len(contacts) == 0 {
+		fmt.Println("Aucun contact trouvé ❌")
+		return
+	}
+	for _, c := range contacts {
+		fmt.Printf("[%d] %s - %s\n", c.ID, c.Nom, c.Email)
+	}
+}
+
+func supprimerContact(reader *bufio.Reader, store storage.Storer) {
+	fmt.Print("ID du contact à supprimer : ")
+	input, _ := reader.ReadString('\n')
+	id, err := strconv.Atoi(strings.TrimSpace(input))
+	if err != nil {
+		fmt.Println("ID invalide")
+		return
+	}
+	if store.Supprimer(id) {
+		fmt.Println("Contact supprimé ✅")
+	} else {
+		fmt.Println("Contact introuvable ❌")
+	}
+}
+
+func mettreAJourContact(reader *bufio.Reader, store storage.Storer) {
+	fmt.Print("ID du contact à mettre à jour : ")
+	input, _ := reader.ReadString('\n')
+	id, err := strconv.Atoi(strings.TrimSpace(input))
+	if err != nil {
+		fmt.Println("ID invalide")
+		return
+	}
+
+	contact, ok := store.Recuperer(id)
+	if !ok {
+		fmt.Println("Contact introuvable ❌")
+		return
+	}
+
+	fmt.Print("Nouveau nom (laisser vide pour garder actuel) : ")
+	nom, _ := reader.ReadString('\n')
+	nom = strings.TrimSpace(nom)
+	if nom != "" {
+		contact.Nom = nom
+	}
+
+	fmt.Print("Nouvel email (laisser vide pour garder actuel) : ")
+	email, _ := reader.ReadString('\n')
+	email = strings.TrimSpace(email)
+	if email != "" {
+		contact.Email = email
+	}
+
+	if c, ok := store.MettreAJour(contact); ok {
+		fmt.Println("Contact mis à jour ✅ :", c.ID, c.Nom, c.Email)
+	} else {
+		fmt.Println("Erreur lors de la mise à jour ❌")
+	}
+}
diff --git a/internal/storage/memory.go b/internal/storage/memory.go
new file mode 100644
index 0000000..69642cb
--- /dev/null
+++ b/internal/storage/memory.go
@@ -0,0 +1,68 @@
+package storage
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type JsonStore struct {
+	filePath string
+	contacts map[int]Contact
+	nextID   int
+}
+
+func NewJsonStore(filePath string) *JsonStore {
+	return &JsonStore{
+		filePath: filePath,
+		contacts: make(map[int]Contact),
+		nextID:   1,
+	}
+}
+
+func (j *JsonStore) save() {
+	data, _ := json.MarshalIndent(j.contacts, "", " ")
+	os.WriteFile("contacts.json", data, 0644)
+}
+
+func (j *JsonStore) Ajouter(c Contact) Contact {
+	c.ID = j.nextID
+	j.contacts[j.nextID] = c
+	j.nextID++
+	j.save()
+	return c
+}
+
+func (j *JsonStore) Lister() []Contact {
+	var list []Contact
+	for _, c := range j.contacts {
+		list = append(list, c)
+	}
+	return list
+}
+
+func (j *JsonStore) Supprimer(ID int) bool {
+	if _, ok := j.contacts[ID]; ok {
+		delete(j.contacts, ID)
+		j.save()
+		return true
+	}
+	return false
+}
+
+func (j *JsonStore) Recuperer(ID int) (Contact, bool) {
+	c, ok := j.contacts[ID]
+	return c, ok
+}
+
+func (j *JsonStore) MettreAJour(c Contact) (Contact, bool) {
+	if _, ok := j.contacts[c.ID]; ok {
+		j.contacts[c.ID] = c
+		j.save()
+		return c, true
+	}
+	return Contact{}, false
+}
+
+func (j *JsonStore) NextID() int {
+	return j.nextID
+}
diff --git a/internal/storage/storage.go b/internal/storage/storage.go
new file mode 100644
index 0000000..2f78d88
--- /dev/null
+++ b/internal/storage/storage.go
@@ -0,0 +1,22 @@
+package storage
+
+import "fmt"
+
+type Contact struct {
+	ID    int    `json:"contact_id"`
+	Nom   string `json:"nom"`
+	Email string `json:"email"`
+}
+
+type Storer interface {
+	Ajouter(c Contact) Contact
+	Lister() []Contact
+	Supprimer(ID int) bool
+	MettreAJour(c Contact) (Contact, bool)
+	Recuperer(ID int) (Contact, bool)
+	NextID() int
+}
+
+var ErrContactNotFound = func(id int) error {
+	return fmt.Errorf("Contact avec l'ID non trouvé")
+}
diff --git a/main.go b/v1/main.go
similarity index 100%
rename from main.go
rename to v1/main.go
diff --git a/main_test.go b/v1/main_test.go
similarity index 100%
rename from main_test.go
rename to v1/main_test.go