Updated Generalities about PT & IT goals

docs/what-is-infinitime/index.md

@@ -1,6 +1,33 @@
 # What is InfiniTime
 ## Generalities about PineTime
+
+PineTime is an open source smartwatch produced by
+[Pine64](https://www.pine64.org).
+
+From Pine64's website:
+
+```
+The PineTime is a free and open source smartwatch capable of running
+custom-built open operating systems. Some of the notable features include a
+heart rate monitor, a week-long battery, and a capacitive touch IPS display that
+is legible in direct sunlight. It is a fully community driven side-project which
+anyone can contribute to, allowing you to keep control of your device.
+```
+
+More details can be found on the [PineTime page of the Pine64
+website](https://www.pine64.org/pinetime/)
+
 ## InfiniTime goals
+
+The goal of this project is to design an open-source firmware for the Pinetime
+smartwatch :
+
+- Code written in **modern C++**
+- Build system based on **CMake**
+- Based on [FreeRTOS 10.0.0](https://freertos.org/) real-time OS
+- Using [LittleVGL/LVGL 7](https://lvgl.io/) as UI library
+- and [NimBLE 1.3.0](https://github.com/apache/mynewt-nimble) as BLE stack
+
 ## InfiniTime features - high level
 ## InfiniTime history
 ### Project history