Updtade Read.me with Docker instructions

README.md

@@ -1,20 +1,42 @@
 # README
 This is a simple blog API project written in Ruby on Rails. The main objective of this is to serve as a study and showcase for Ruby on Rails features.
 
-### Ruby version
+## Ruby version
 3.1.2
 
-### Database creation
-`bundle exec rake db:create`
-
-### Database
+## Database
 PostgreSQL
 
-### How to run the test suite
+## Running on Docker containers
+
+Build and start cotainers:
+
+`docker-compose up`
+
+API will run on `localhost:3000`.
+
+If running for the first time, create the database:
+
+`docker compose run web rake db:create`
+
+If there are pending migrations, run migrations:
+
+`docker compose run web rake db:migrate`
+
+## Running on local machine
+Make sure you have:
+- Required Ruby version
+- Bundler
+- Postgres database running
+
+#### Database creation
+`bundle exec rake db:create`
+
+#### How to run the test suite
 `bundle exec rspec` 
 
-### Start server
+#### Start server
 `bundle exec rails s`
 
-### Start console
+#### Start console
 `bundle exec rails c`