Add directives for .ini style configuration

Migration-from-SQLite-to-PostgreSQL.md

@@ -1,4 +1,12 @@
-SQLite is the default storage backend setup in the file settings.py with the block :
+SQLite is the default storage backend setup.
+
+It's configured both in the default `etesync-server.ini` file with the following block
+
+    [database]
+    engine = django.db.backends.sqlite3
+    name = db.sqlite3
+
+and using the Django style in `etesync_server/settings.py` with the block :
 
     DATABASES = {  
         'default': {    
@@ -38,6 +46,17 @@ You will need to setup a database to hold your data.
     exit
 
 ### Configure EteSync for PostgreSQL
+Either using the .ini configuration file
+
+    [database]
+    engine = django.db.backends.postgresql
+    name = etesync
+    user = etesync
+    password = etesync
+    host = 127.0.0.1
+    port = 5432
+
+Or using Django style configuration.
 
     DATABASES = {
         'default': {
@@ -72,4 +91,5 @@ This should end up running with no errors.
 
 `./manage.py runserver 127.0.0.1:8000` if you are behind a reverse-proxy for example
 
-### Enjoy EteSync !
+### Enjoy EteSync !
+