GH-19: Implement the CLI and hande command arguments (GH-21)

* Implement the initial version of the CLI
* Register `click` in the dependency list
* Add `--as` option and make the `Thumbnails` creation concurrently
* Override method name to correspond with the functionality

Author: ArtyomVancyan

thumbnails/__main__.py

@@ -15,7 +15,7 @@
 
 def worker(video, as_):
     video.extract_frames()
-    formatter = ThumbnailFactory.get_thumbnail(as_, video)
+    formatter = ThumbnailFactory.get_formatter(as_, video)
     formatter.prepare_thumbnails()
     formatter.generate()
 

thumbnails/formatter.py

@@ -24,7 +24,7 @@ class ThumbnailFactory:
     thumbnails = {}
 
     @classmethod
-    def get_thumbnail(cls, typename, *args, **kwargs) -> ThumbnailFormat:
+    def get_formatter(cls, typename, *args, **kwargs) -> ThumbnailFormat:
         try:
             return cls.thumbnails[typename](*args, **kwargs)
         except KeyError: