🚧 Starts sessions

src/window/session.py

@@ -0,0 +1,25 @@
+from tkinter import *
+
+
+class SessionWindow:
+    def __init__(self, app):
+        self.app = app
+
+        self.window = Toplevel(app.root)
+        self.window.title("Custom session")
+        self.window.geometry("600x600")
+        self.window.protocol("WM_DELETE_WINDOW", self.save_on_closing)
+
+        self.list_in_session = []
+
+        self.update_session_list()
+
+
+    def update_session_list(self):
+        for i, session in enumerate(self.list_in_session):
+            new_session = Button(text="")
+            new_session.grid(row=i, column=0)
+
+    def save_on_closing(self):
+        # TODO save
+        self.window.destroy()