Modify gitignore and SamplePath class

.gitignore

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+__pycache__

main_package/classes/sample_path.py

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+import pandas as pd
+import numpy as np
+import importer as imp
+import trajectory as tr
+
+
+class SamplePath():
+
+    def __init__(self, files_path):
+        self.importer = imp.Importer(files_path)
+        self.trajectories = []
+
+
+    def build_trajectories(self):
+        self.importer.import_data_from_csv()
+        self.importer.merge_value_columns_in_all_frames()
+        for data_frame in self.importer.get_data_frames():
+            trajectory = tr.Trajectory(data_frame)
+            self.trajectories.append(trajectory)
+        self.importer.clear_data_frames()
+
+    def get_number_trajectories(self):
+        return len(self.trajectories)
+
+
+
+######Veloci Tests#######
+
+s1 = SamplePath("../data")
+s1.build_trajectories()
+print(s1.get_number_trajectories())
+print(type(s1.trajectories[0].get_trajectory()[0][1]))
+
+