Added protocol specification

Author: Francesco Mecatti

ProtocolImplementation/ServerProtocolImplementation/__init__.py

@@ -1,3 +1,4 @@
 """
 Server-side protocol implementation.
+This multi threading server is able to manage multiple connections.
 """

README.md

@@ -1,5 +1,36 @@
 # Python Socket FileServer
 
+
+Python implementation of a custom protocol to send and receive files (binary data) over the network.
+
+For protocol specification see [protocol diagrams](#protocol-diagrams) and [implementation](/ProtocolImplementation/Protocol.py).
+
+This is an application-layer protocol, carried by a TCP connection, that aims to turn a simple socket stream into a reliable way to transfer long files by sending start, end and control bytes, as well as defining and handling different types of error.
+
+This multi threading server is able to manage multiple connections.
+
+## Table of Contents
+
+* [Usage](#usage)
+* [Protocol Diagrams](#protocol-diagrams)
+* [Authors](#authors)
+
+
+## Usage
+
+Server-side:
+run `py server.py`
+
+Client-side (one or multiple clients):
+run `py client.py`
+
+## Protocol diagrams
+
 ![Protocol Input Output](Protocol_Input_Output.png)
+
 ![Protocol Upload Download](Protocol_Upload_Download.png)
 
+
+## Authors
+
+ - Francesco Mecatti - I.T.I.S Enrico Fermi - Italy, Modena