Added readme

README.md

+# Gazelle HL7v2 Validator
+
+<!-- TOC -->
+* [Gazelle HL7v2 Validator](#gazelle-hl7v2-validator)
+  * [Build and tests](#build-and-tests)
+  * [Installation manual](#installation-manual)
+    * [Configuration for sso-client-v7](#configuration-for-sso-client-v7)
+  * [User manual](#user-manual)
+  * [Release note](#release-note)
+<!-- TOC -->
+
+## Build and tests
+
+The project must be build using JDK-8 and run on a JDK-7 environment.
+
+```shell
+mvn clean install
+```
+
+## Installation manual
+
+The Gazelle HL7v2 Validator installation manual is available here:
+https://gazelle.ihe.net/gazelle-documentation/Gazelle-HL7-Validator/installation.html
+
+### Configuration for sso-client-v7
+
+As Gazelle HL7v2 Validator depends on sso-client-v7, it needs to be configured properly to work. You can follow the README of sso-client-v7
+available here: [sso-client-v7](https://gitlab.inria.fr/gazelle/library/sso-client-v7)
+
+## User manual
+
+The Gazelle HL7v2 Validator user manual is available here:
+https://gazelle.ihe.net/gazelle-documentation/Gazelle-HL7-Validator/user.html
+
+## Release note
+
+The Gazelle HL7v2 Validator release note is available here:
+https://gazelle.ihe.net/gazelle-documentation/Gazelle-HL7-Validator/release-note.html
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