Update README.md

README.md

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 Another localisation packet protocol to send/receive localisation data over networks.
 
+## Details
+
+LocaPack is an implementation of the locapack protocol used to send or receive various localisation data over wired and wireless networks.
+
 LocaPack enables the transport of:
-- universal GNSS localisation coordonates,
-- locally referenced localisations, such as indoor environments, with automatic mapping of coordonates in a universal GNSS translation,
-- inter-node proximity informations such as ranging data
+- universal GNSS localisation coordonates such as latitude/longitude data, 
+- locally referenced localisations, such as {x,y} positions in an indoor environment,
+- inter-node proximity information such as ranging data.
+
+Some extra features are also avalable, such as:
+- automatic mapping/translation of coordonates between universal GNSS/locally referenced localisations,
+- movement_id, that enables extra movement information (typically based on a local accelerometer)
+- packet sequence numbering and local timestamping, to track positions and detect missing information
  
 Several implementations are available: 
 - Embedded: C++ class (Arduino)
 - Infrastrucure/IoT: Node-RED palette
 - Portable: python
 
-A Json description of the messages.
+A Json description of the messages is also available.
 
 ## Implementation