chg: [doc] add basic server readme

server/README.md

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+# D4 core
+
+![](https://www.d4-project.org/assets/images/logo.png)
+
+## 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
+
+- Python 3.6
+- GNU/Linux distribution
+
+### Installation
+
+###### Install D4 server
+~~~~
+cd server
+./install_server.sh
+~~~~
+Create or add a pem in [d4-core/server](https://github.com/D4-project/d4-core/tree/master/server) :
+~~~~
+cd gen_cert
+./gen_root.sh
+./gen_cert.sh
+cd ..
+~~~~
+
+
+###### Launch D4 server
+~~~~
+./LAUNCH.sh -l
+~~~~
+
+The web interface is accessible via `http://127.0.0.1:7000/`
+
+### Notes
+
+- All server logs are located in ``d4-core/server/logs/``
+- Close D4 Server: ``./LAUNCH.sh -k``
+
+### Screenshots of D4 core server management
+
+![](https://raw.githubusercontent.com/D4-project/d4-core/master/doc/images/main.png)
+![](https://raw.githubusercontent.com/D4-project/d4-core/master/doc/images/sensor-mgmt.png)
+![](https://raw.githubusercontent.com/D4-project/d4-core/master/doc/images/server-mgmt.png)
+![](https://raw.githubusercontent.com/D4-project/d4-core/master/doc/images/analyzer-mgmt.png)
+![](https://raw.githubusercontent.com/D4-project/d4-core/master/doc/images/server-mgmt2.png)