Network & NetworkManager interface added

interface/network/Network.py

+import json
+
+
+class Network:
+    def __init__(self,
+                 id,
+                 name,
+                 status,
+                 subnet_ids,
+                 created_at
+                 ) -> None:
+        super().__init__()
+
+        self.id = id
+        self.name = name
+        self.status = status
+        self.subnet_ids = subnet_ids
+        self.created_at = created_at
+
+    def __str__(self) -> str:
+        return self.toJSON()
+
+    def toJSON(self):
+        return json.dumps(self.__dict__)

interface/network/NetworkManager.py

+from interface.network.Network import Network
+
+
+class NetworkManager:
+    def __init__(self) -> None:
+        super().__init__()
+
+    def create(self) -> Network:
+        raise NotImplementedError
+
+    def get(self, id) -> Network:
+        raise NotImplementedError
+
+    def delete(self, id) -> bool:
+        raise NotImplementedError
+
+    def list(self) -> []:
+        raise NotImplementedError