add more details in railway deploy doc

docs/pages/noty-api/deployment-railway.md

@@ -17,6 +17,11 @@ Whenever deployment is triggered, it executes Gradle task - `build` which will b
 ```gradle
 build.finalizedBy(installDist)
 ```
+Or use below code if you're using Gradle Kotlin DSL
+
+```kotlin
+tasks.getByName("build").finalizedBy("installDist")
+```
 
 ### Create Procfile
 
@@ -32,6 +37,9 @@ web: application/build/install/application/bin/application
 
 - Create a project on Railway.app (from GitHub).
 - Configure deployment branch as `master` and directory `noty-api` (_as API source is in directory_).
-- Add PostgreSQL Database service in Railway.app.
-- Configure environment variables (_as seen in the above image_).
+- Add PostgreSQL Database service in Railway.app. Steps below
+    - Go to https://railway.app/dashboard on a new tab
+    - Click on new project (or directly go to https://railway.app/new)
+    - Select `Provision PostgreSQL`
+- Configure environment variables (_as seen in the above image_, you'll need to create `DATABASE_DRIVER`, `DATABASE_MAX_POOL_SIZE` and `SECRET_KEY` environment variables, rest will be created by railway once you add postgres).
 - After this, just deploy and check whether everything is working fine.