Extend PostgreSQL implementation and unit tests on MongoDB storage

README.md

@@ -130,8 +130,17 @@ The OIDC provider needs [Etcd v3](https://etcd.io/) (see below for storage consi
 COOPGO Mobility Accounts supports the following databases for storage :
 
 - [x] MongoDB
+- [x] PostgreSQL
 
-Feel free to contribute any other storage option.
+#### SQL schema 
+
+SQL schema for PostgreSQL is available from file `storage/postgresql/schema.hcl` in the [atlasgo Data Definition Language](https://atlasgo.io/getting-started) format
+
+To set your development DB with this schema easily, you can simply use atlasgo CLI :
+
+```
+atlas schema apply --url "postgresql://username:password@localhost:5432/coopgo_platform?sslmode=disable"
+```
 
 ### OpenID Connect provider