Add a simple yaml reader

cyber_sandbox_creator/io/reader.py

+import yaml
+
+from pathlib import Path
+from typing import Union, List, Dict
+
+
+class Reader:
+    """Static methods for reading from files"""
+
+    @staticmethod
+    def open_yaml(file_path: Path) -> Union[List, Dict]:
+        """Open a yaml file and return its content"""
+        try:
+            with file_path.open() as input_file:
+                return yaml.safe_load(input_file)
+        except yaml.YAMLError:
+            raise IOError(f"Could not parse yaml file {file_path}.")
+        except IOError:
+            raise IOError(f"Could not open yaml file {file_path}.")