Add initial project structure with database connection and routing setup

- Create .env.example and .gitignore to manage environment variables
- Implement database connection logic in bd.go
- Define project model and data retrieval functions in projet.go
- Set up HTTP routes for project management in routes/projet.go
- Add main entry point in main.go to start the server

main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"api_serveurless_go/routes"
+	"net/http"
+)
+
+func main() {
+	// Configuration des routes
+	routes.SetupRoutes()
+
+	// Démarrage du serveur
+	http.ListenAndServe(":3000", nil)
+}