update readmes

Author: finger563

README.md

@@ -32,6 +32,8 @@ Link to Fusion 360 CAD:
 
 The printable files can be found in the [./mcad](./mcad) folder or can be downloaded from [printables](https://www.printables.com/model/396931-esp-box-emu).
 
+The electrical files can be found in the [./ecad](./ecad) folder.
+
 This project has the following features (still WIP): 
 
  - [x] Squareline Studio design files for generating boilerplate LVGL ([SLS files](./squareline), [Generated files](./components/gui/generated))

ecad/README.md

@@ -0,0 +1,14 @@
+# ESP-BOX-EMU ecad
+
+This folder contains the electronic design of the ESP-BOX-EMU.
+
+The ESP-BOX-EMU contains a single circuit board with the following components:
+- USB-C connector
+- Tactile switches for the buttons
+- DRV2605L haptic driver
+- JST-PH connector for the LiPo battery
+- MCP23017 I/O expander
+- MCP73833 LiPo charger
+- MicoSD card slot
+- TPS61070 boost converter
+