Added Theme, Battery, AppManager

Settings.md

@@ -170,3 +170,23 @@ The Menu Color app can be used to change the background color scheme of the app
 
 ![SCR_0080](https://github.com/portapack-mayhem/mayhem-firmware/assets/129641948/502ad48c-c6a5-40d7-ac06-ea6193303864)
 ![SCR_0081](https://github.com/portapack-mayhem/mayhem-firmware/assets/129641948/45ceb64e-7dcc-40b1-b832-0d428ea02e42)
+
+## Theme
+- Choose the global theme color, that will also be applied to apps
+- Override "Menu Color" with the theme one, or keep the one selected in "Menu Color"
+
+![image](https://github.com/user-attachments/assets/cc46c4df-53a7-402e-96c8-7ee3befda184)
+
+## Battery 
+Choose battery calculation method, reset values.
+
+Override:
+- checked = voltage based
+- unchecked = ic based
+
+![image](https://github.com/user-attachments/assets/7709cf0b-2c8c-4d2b-9c72-17a6437dfc16)
+
+## AppManager 
+Allow you to hide/unhide application, and set/unset the autostart application.
+
+![image](https://github.com/user-attachments/assets/d176fcb9-976e-4b4a-b934-a3cd734831ee)