update Readme

Author: thomas-kl1

README.md

@@ -1,2 +1,5 @@
-# magento-2-data-model-sample
-Magento 2 Data Model Structure
+# Magento 2 : How to create a Data Model
+
+- [Part 1 - Data Model](https://black.bird.eu/en/blog/recettem2.html)
+- [Part 2 - Resource Model](https://black.bird.eu/en/blog/recettem2-2.html)
+- [Part 3 - Entity Manager](https://black.bird.eu/en/blog/recettem2-3.html)