feat: add brief description and specifications

docs/index.md

@@ -2,8 +2,30 @@
 
 <img src="/images/device.png"/>
 
-## Contents
+## Overview
 
-* Get started following the [Quick start guide](quick_start_guide.md)
-* Flash a new image [Image flashing guide](flash_image_guide.md)
-* [Troubleshooting](troubleshooting.md)
+The MEDEA GNSS computer is a device that combines a Linux enabled computer with a multi-frequency GNSS chipset, inertial sensors, and several expansion ports aimed at developing GNSS-enabled applications.
+
+## Hardware specs
+- Single core ARM cortex A-8  up to 1GHz, with MMU, FPU and NEON support.
+- 2x RISC co-processors  up to 200MHz, shared memory interconnect with the main processor.
+- 512MB DDR3 SDRAM.
+- 4GB eMMC non-removable non-volatile storage.
+- Multi constellation, multi frequency GNSS receiver module (Ublox ZED-F9P).
+- Dedicated connector to extend MEDEA with additional functionality via a daughter board. 
+- 9DoF IMU (accelerometer, gyroscope and magnetometer)
+- 10/100Mbps Ethernet interface.
+- Externally accessible USB 2.0 (type A) host port.
+- Externally accessible micro-SD card slot.
+- Supplied by +5V DC via the USB-C port.
+- Optional high precision 6DoF (accelerometer + gyroscope) IMU (ADIS165xx)
+- Optional LTE connectivity.
+- Optional WiFi connectivity.
+
+## Mechanical specs
+- 103 x 63 x 18mm
+- 160g
+
+## Supply requirements
+- 5v DC single supply.
+- ~5W without optional accessories.