Completed first version of what-is-infinitime

docs/what-is-infinitime/index.md

@@ -27,6 +27,100 @@ smartwatch :
 - and [NimBLE 1.3.0](https://github.com/apache/mynewt-nimble) as BLE stack
 
 ## InfiniTime features - high level
+
+InfiniTime implements the following features:
+
+- Rich user interface via display, touchscreen and pushbutton
+- Time synchronization via Bluetooth Low Energy (BLE)
+- Time setup via the watch itself
+- Notifications via BLE
+- Heart rate measurements
+- Steps counting
+- Wake-up on wrist rotation
+- Quick actions
+  - Disable vibration on notification
+  - Brightness settings
+  - Flashlight
+  - Settings
+- 3 watch faces:
+  - Digital
+  - Analog
+  - [PineTimeStyle](https://wiki.pine64.org/wiki/PineTimeStyle)
+- Multiple 'apps' :
+  - Music (control the playback of music on your phone)
+  - Heart rate (measure your heart rate)
+  - Navigation (displays navigation instructions coming from the companion app)
+  - Notification (displays the last notification received)
+  - Paddle (single player pong-like game)
+  - Twos (2048 clone game)
+  - Stopwatch
+  - Alarm App
+  - Steps (displays the number of steps taken)
+  - Timer (set a countdown timer that will notify you when it expires)
+  - Metronome (vibrates to a given bpm with a customizable beats per bar)
+- User settings:
+  - Display timeout
+  - Wake-up condition
+  - Time format (12/24h)
+  - Default watch face
+  - Daily steps goal
+  - Battery status
+  - Firmware validation
+  - System information
+- Supported by 3 companion apps (development is in progress):
+  - [Gadgetbridge](https://codeberg.org/Freeyourgadget/Gadgetbridge/) (on Android via F-Droid)
+  - [Amazfish](https://openrepos.net/content/piggz/amazfish) (on SailfishOS and Linux)
+  - [Siglo](https://github.com/alexr4535/siglo) (on Linux)
+  - [Experimental] [WebBLEWatch](https://hubmartin.github.io/WebBLEWatch/) Synchronize time directly from your web browser. [video](https://youtu.be/IakiuhVDdrY)
+  - [Experimental] [InfiniLink](https://github.com/xan-m/InfiniLink) (on iOS)
+  - OTA (Over-the-air) update via BLE
+  - [Bootloader](https://github.com/JF002/pinetime-mcuboot-bootloader) based on
+    [MCUBoot](https://www.mcuboot.com/)
+
 ## InfiniTime history
+
 ### Project history
+
+The project was started by [JF](https://github.com/JF002/) in October 2019.
+JF already knew Pine64 as a company that builds ARM-based SBCs, and had
+followed the Pinebook Pro and PinePhone.
+In September 2019, JF saw an article about the PineTime, an open-source
+smartwatch, stating that Pine64 was looking for developers to build a software
+running on it.   
+After he contacted Pine64 to explain his motivation, he got sent a PineTime dev
+kit and starting tinkering with it.
+
+The first version of the bootloader, based on MCUBoot, was written by [Lup
+Yuen](https://lupyuen.github.io/).
+
+The first versions of InfiniTime were mainly a one-man show, but quickly a lot
+of developers joined the project, and the speed of development and therefore new
+features increased a lot:
+
+- The first release, version 0.1.0 already provided basic functionalities :
+  display the time, BLE connection and time synchronization. There was no touch
+  interface, the UI was slow and basic.
+- Version 0.2.2 was the first release that received contributions from other
+  developpers :)
+  project!
+- Version 0.3 switched from a custom graphics library to LittleVGL, a light and
+  versatile graphics library for embedded systems. 
+- Version 0.5 introduced a change of the BLE stack: instead of using the NRF
+  SoftDevice (the BLE stack from Nordic Semiconductor), the decision was taken
+  to use [NimBLE](https://github.com/apache/mynewt-nimble), an open source BLE
+  stack.   
+  Amazfish, a companion app for Sailfish OS and Linux, added support for
+  InfiniTime, becoming the first companion app for the smartwatch. 
+- Version 0.6 brought the OTA functionality, allowing users to upgrade the
+  firmare over-the-air, using their smartphone and BLE connectivity. 
+- Version 0.7.1, which brought improvements, optimisations, became the official
+  firmware sent with new PineTime (previous firmware was a "work in progress"
+  one, and closed-source).
+
 ### Firmwares history and changelog
+
+The releases history can be found [here on
+GitHub](https://github.com/InfiniTimeOrg/InfiniTime/releases).   
+
+For a list with a summary of new features for each release, please [see this
+article](https://www.ncartron.org/pinetimes-infinitime-firmwares-history60.html).