add migrations and readme

README.md

@@ -1,2 +1,30 @@
 # Backend
 
+
+# ApiService
+
+Database connection in appsettings.json:
+    username:postgres
+    password:postgres
+    host:localhost
+    port:5432
+    database:prod
+
+
+
+if no migrations
+
+dotnet ef migrations add UserContextMigration --context UserContext
+dotnet ef database update --context UserContext
+
+dotnet ef migrations add WeatherForecastContextMigration --context WeatherForecastContext
+dotnet ef database update --context WeatherForecastContext
+
+and etc for each dbcontext in project
+
+if you have Migrations folder in ApiService project just call (in dev mode app) post: /api/db/migrate
+
+/api/swagger - path to swagger
+
+
+