chg: [doc] Add more explanation of d4-core

README.md

@@ -1,17 +1,43 @@
 # D4 core
 
-Software components used for the D4 project
+D4 core are software components used in the D4 project. The software includes everything to create your own sensor network or connect
+to an existing sensor network using simple clients.
 
 ## D4 core client
 
+[D4 core client](https://github.com/D4-project/d4-core/tree/master/client) is a simple and minimal implementation of the [D4 encapsulation protocol](https://github.com/D4-project/architecture/tree/master/format).
+
+### Requirements
+
+- Unix-like operating system
+- make
+- a recent C compiler
+
+### Installation
+
 ~~~~
+cd client
 git submodule init
 git submodule update
 ~~~~
 
+## D4 core server
+
+D4 core server is a complete server to handle clients (sensors) including the decapsulation of the [D4 protocol](https://github.com/D4-project/architecture/tree/master/format), control of
+sensor registrations, management of decoding protocols and dispatching to adequate decoders/analysers.
+
 ### Requirements
 
-- uuid-dev
-- make
-- a recent C compiler
+- Python 3.6
+- GNU/Linux distribution
+
+### Installation
+
+~~~~
+cd server
+./install_server.sh
+./LAUNCH.sh -l
+~~~~
+
+The web interface is accessible via `http://127.0.0.1:7000/`