Refactor the code to make it comply with PEP-8 standards:Convert all class definitions to CamelCase style.

(issue 37)

src/component/ndn_client/__init__.py

@@ -1 +1,2 @@
-from .cid import content_id
+from .cid import ContentId
+from .ndn_client import NDN_Client

src/component/ndn_client/cid.py

@@ -1,8 +1,9 @@
 
 
-class content_id:
+class ContentId:
     def __init__(self) -> None:
         pass
 
+    @staticmethod
     def create_from_str(cid_str:str):
         pass

src/component/ndn_client/ndn_client.py

@@ -1,13 +1,13 @@
 
-from .cid import content_id 
+from .cid import ContentId 
 
-class ndn_get_task:
+class NDN_GetTask:
     def __init__(self) -> None:
         pass
 
-class ndn_client:
+class NDN_Client:
     def __init__(self):
         pass
 
-    def get_file(cid:content_id,target_path:str,urls:{}=None,options:{}=None):
+    def get_file(self,cid:ContentId,target_path:str,urls:{}=None,options:{}=None):
         pass