Start dev (#4)

* Add Netbox configuration and plugins
* Add Containerlab topology 
* Add template
* Update Documentation

utilities/Create_Fabric/add_customers.py

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+from helpers.netbox_backend import NetBoxBackend
+import sys
+
+# Ask user for NetBox connection details
+url = input("Enter NetBox URL: ")
+token = input("Enter NetBox API Token: ")
+nb_backend = NetBoxBackend(url, token)
+
+# Ask for customer details
+customer_name = input("Enter Customer Name: ")
+vlan_id = int(input("Enter VLAN ID: "))
+vni_id = int(input("Enter VNI ID: "))
+
+# Get available locations
+locations = list(nb_backend.nb.dcim.locations.all())
+for idx, loc in enumerate(locations):
+    print(f"{idx}: {loc.name}")
+selected_indices = input("Select one or multiple locations by index (comma-separated): ")
+selected_locations = [loc for i, loc in enumerate(locations) if str(i) in selected_indices.split(",")]
+
+# Create tenant
+tenant = nb_backend.create_tenant(customer_name, customer_name.lower().replace(" ", "-"))
+
+# Update locations to attach them to the tenant
+for location in selected_locations:
+    try:
+        location.tenant = tenant.id
+        location.save()
+    except Exception as e:
+        print(f"[ERROR] Failed to update location {location.name} with tenant: {e}")
+
+# Allocate /24 prefix for customer
+role_id = nb_backend.nb.ipam.roles.get(slug="customerscontainer").id
+parent_prefixes = list(nb_backend.nb.ipam.prefixes.filter(role_id=role_id))
+if not parent_prefixes:
+    print("[ERROR] No available parent prefix found.")
+    sys.exit(1)
+
+customer_prefix = nb_backend.allocate_prefix(parent_prefixes[0], 24, None, None)
+if not customer_prefix:
+    print("[ERROR] Could not allocate /24 for customer.")
+    sys.exit(1)
+
+# Create L2VPN
+l2vpn_slug = f"{customer_name.lower().replace(' ', '-')}-vpn"
+l2vpn = nb_backend.create_l2vpn(vni_id, f"{customer_name}_vpn", l2vpn_slug, tenant.id)
+
+# Create VLAN
+vlan_slug = f"{customer_name.lower().replace(' ', '-')}-vlan"
+vlan = nb_backend.create_vlan(vlan_id, f"{customer_name}_vlan", vlan_slug, tenant.id)
+
+# Create VXLAN termination
+vxlan_termination = nb_backend.create_vxlan_termination(l2vpn.id, "ipam.vlan", vlan.id)
+
+# Assign IP to leaf devices Ethernet3
+for location in selected_locations:
+    leaf_devices = nb_backend.nb.dcim.devices.filter(role="leaf", location_id=location.id)
+    if leaf_devices:
+        ip_list = nb_backend.get_available_ips_in_prefix(customer_prefix)
+        if len(ip_list) < len(leaf_devices):
+            print("[ERROR] Not enough IP addresses available in the allocated /24.")
+            sys.exit(1)
+        
+        for device, ip in zip(leaf_devices, ip_list):
+            interface = nb_backend.get_or_create_interface(device.id, "Ethernet3")
+            nb_backend.assign_ip_to_interface(interface, ip.address)
+    else:
+        print(f"[ERROR] No leaf devices found in location {location.name}.")