Updated README.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

Author: polhenarejos

README.md

@@ -1,2 +1,24 @@
 # pycvc
 Card Verifiable Certificates (CVC) tools for Python
+
+## Introduction
+
+Card Verifiable Certificates are an specification of storing electronic certificates, signed by RSA or Elliptic Curves algorithms.
+
+In contrast to X509 certificates, CVC are more compact and are widely used by HSM cards or personal USB tokens.
+
+pycvc implements the specifications of BSI TR 03110 to create CV certificates and requests.
+
+pycvc can be used to make a CV request and deploy a PKI based on CVC.
+
+## Install
+
+```
+pip install pycvc
+```
+
+## Usage
+
+pycvc can be used by importing the package or calling the command line tools `cvc-create`, for CVC generation, and `cvc-print`, for displaying CVC information and verification.
+
+For more information, execute `cvc-create` or `cvc-print` with `--help` flag.