add cli sub-command to support installed readers

src/pynxtools/dataconverter/convert.py

@@ -467,3 +467,10 @@ def write_to_file(text):
             ensure_ascii=False,
         )
     )
+
+
+@main_cli.command("get-readers")
+def get_reader_cli():
+    "Prints a list of all installed readers."
+    readers = get_names_of_all_readers()
+    logger.info(f"The following readers are currently installed: {readers}.")