initial readme file

README.md

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+Migrations
+==========
+
+Add the following settings to your console application configuration file:
+
+```php
+return [
+    // ...
+    'controllerMap' => [
+        'migrate' => [
+            'class' => \yii\console\controllers\MigrateController::class,
+            'migrationNamespaces' => [
+                'Da\User\Migration',
+            ],
+        ],
+    ],
+    // ...
+];
+```
+
+This will allow you to run only a single console command:
+
+```
+./yii migrate
+```
+
+It prevents you from manual tracking of new migrations coming from our extension. What if we would add a new migration class, and you forgot to run appropriate console command to launch them?
+
+Without namespaced migrations it would be:
+
+```
+./yii migrate
+./yii migrate --migrationPath="@Da/User/resources/migrations"
+```
+
+Without namespaced migrations it's just:
+
+```
+./yii migrate
+```