base implementation of SettingsManager singleton class

need to load cameras base on the connected cameras instead of all cameras in cams directory

backend/Main.py

@@ -1,9 +1,11 @@
 import tornado.ioloop
 
 from app.ChameleonVisionApp import ChameleonApplication
+from app.classes.Settings import SettingsManager
 from tornado.options import options
 
 if __name__ == "__main__":
+    mng = SettingsManager.get_instance()
     tornado.options.parse_command_line()
     app = ChameleonApplication()
     print(f"Serving on port {options.port}")