Update README.md

Author: mservillat

README.md

@@ -1,9 +1,16 @@
-# doc-template
-document template
+[![EPNTAP version](https://img.shields.io/badge/ObsCore-REC--1.1-yellow.svg)](https://ivoa.net/documents/ObsCore/)
+[![PDF-Preview](https://img.shields.io/badge/Preview-PDF-blue)](../../releases/download/auto-pdf-preview/ObsCore.pdf)
+
+# Observation Data Model Core Components and its Implementation in the Table Access Protocol
+
+This document defines the core components of the Observation data model that are necessary to perform data discovery when querying data centers for astronomical observations of interest.
+
+## Status
+
+The last stable version is REC-1.1. Current work consist of a convertion of the REC-1.1 to the ivoatex format, and preparation for a next sub-version to integrate domain specific extensions.
 
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