created basic Plotter test

src/test_plotter.py

+from pathlib import Path
+
+from Dataset import Dataset
+from Plotter import Plotter
+import pandas as pd
+
+this_file_dir = Path(__file__).parent
+
+
+def test_load_plotter():
+    dataset = Dataset(this_file_dir / "../data/GamingStudy_data.csv")
+    plotter = Plotter(dataset)
+    assert type(plotter.df) == pd.DataFrame
+    assert type(plotter.ds) == Dataset