Update README.md

README.md

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-# C-ITS ITS-S Reference implementation
+# C-ITS ITS-S Reference Implementation
 
 This is a reference implementation of the ITS-S (a client side) as defined in ETSI C-ITS standards.
 Its main purpose is to enable implementators of the ITS-S software to study and validate their implementations from a security perspective.
@@ -8,6 +8,48 @@ It also contains a simple [ITS-G5](https://en.wikipedia.org/wiki/IEEE_802.11p) n
 Cooperative Intelligent Transport Systems (C-ITS) allow road users and traffic managers to share information and use it to coordinate their actions.
 It is a set of standards that describes data exchange between high-speed vehicles and between the vehicles and the roadside infrastructure, so called V2X communication.
 
+## Quick start
+
+ 1. Ensure that you have Python 3.5, 3.6 or 3.7 installed.  
+    Please referrer to a documentation of your OS or to a Python official documentation how to install Python.
+    We assume, that your python interpretter is available as `python3` binary.  
+    Supported OS are: Linux, Windows, Mac OSX.
+
+ 2. [Ensure](https://pip.pypa.io/en/stable/installing/) that you have pip, the python installer.
+
+ 3. Install dependencies
+
+         pip3 install -U asn1tools
+         pip3 install -U cryptography
+         pip3 install -U requests
+
+ 4. Clone the repository
+
+         git clone https://github.com/TeskaLabs/c-its-itss.git
+
+## Usage
+
+         $ ./itss.py --help
+         usage: itss.py [-h] [-e EA_URL] [-a AA_URL] [--g5-sim G5_SIM] DIR
+         
+         C-ITS ITS-S reference implementation focused on a security.
+         C-ITS standards: ETSI TS 102 941 v1.1.1, ETSI TS 103 097 v1.2.1
+         It also contains a simple ITS-G5 network simulator that utilizes UDP IPv4 multicast.
+         
+         (C) 2018 TeskaLabs
+
+         positional arguments:
+           DIR                   A directory with persistent storage of a keying
+                                 material
+         
+         optional arguments:
+           -h, --help            show this help message and exit
+           -e EA_URL, --ea-url EA_URL
+                                 URL of the Enrollment Authority
+           -a AA_URL, --aa-url AA_URL
+                                 URL of the Authorization Authority
+           --g5-sim G5_SIM       Configuration of G5 simulator
+
 
 ## C-ITS standards