Fixing containerlab hackfest example

Closes #158 (closed)

hackfest/containerlab/README.md

+# ContainerLab
+
+The setup consists of a management network for configuring and managing nodes.
+srl1 and srl2 are interconnected.
+client1 is connected to srl1 and client2 to srl2.
+Routing between client1 and client2 is set up via the Nokia SR Linux nodes.
+
+## Management Network
+Name: mgmt-net
+Subnet: 172.100.100.0/24
+
+## Node Kinds
+Nokia SR Linux: Image ghcr.io/nokia/srlinux:23.10.3
+Linux: Image ghcr.io/hellt/network-multitool
+
+## Nodes
+
+### Nokia SR Linux
+- Type: ixr6
+- CPU: 0.5
+- Memory: 2GB
+- Management IP: 172.100.100.101
+
+The provided SR Linux CLI commands in the _srl.cli_ enables system management and configures the GNMI server with OpenConfig models.
+
+### Linux
+
+Assigns IP 172.16.1.10/24 to eth1 and adds route to 172.16.2.0/24 via 172.16.1.1
+
+In this topology file, the clients are pre-configured with the respectivly IP addresses in their interfaces and routes in their IP tables.
+
+### Links
+- Connect srl1:e1-1 to srl2:e1-1
+- Connect client1:eth1 to srl1:e1-2
+- Connect client2:eth1 to srl2:e1-2
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