add docker setup guide to contribution guides

docs/contributing-guide/setup/docker.md

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+
+# Docker Setup Guide
+
+Make sure you have Docker installed on your system.
+If not please follow [this](https://docs.docker.com/get-docker/) guide.
+Also, don't forget to stop your local running services like postgres, redis and elasticsearch while you're using docker to run your app.
+This will prevent you from port binding conflicts which might already be taken by your local running services.
+## Installation
+
+#### 1. [Fork repository](https://github.com/saeloun/miru-web/fork) to your account
+
+#### 2. Clone the repo to local
+
+```bash
+$ git clone https://github.com/<your-name>/miru-web.git
+```
+
+#### 3. Go to the project directory
+```bash
+$ cd miru-web/
+```
+#### 4. Start Docker containers for your services
+ To start all docker services defined in `docker-compose.yml`, Run:
+```bash
+$ docker compose up
+```
+Wait for the Docker to build the image defined in `Dockerfile.local` and up your containers for defined services in `docker-compose.yml`.
+Once the database and redis service are up, Webpacker will compile the assets, and you will see your rails server running with elasticsearch and sidekiq.
+
+#### 5. Setup database
+Once you see everything running correctly, Open a new terminal tab and run:
+```bash
+$ docker-compose exec app bundle exec rails db:reset
+```
+OR you can exit out of the running server by pressing `Ctrl + C` and run:
+```bash
+$ docker-compose run --rm app bundle exec rails db:reset
+```
+Note that `db:reset` and `db:setup` both will work here.
+`db:reset` is just equivalent to `bin/rails db:drop db:setup`.\
+This will setup your database with seed data.
+#### 6. Navigate to [http://0.0.0.0:3000](http://0.0.0.0:3000) to access your running app.
+
+#### 7. To run rails console
+When app is running, open a new terminal tab and run:
+```bash
+$ docker-compose exec app bundle exec rails console
+```
+OR run:
+```bash
+$ docker-compose run --rm app bundle exec rails console
+```
+when app is not running.\
+Similarly if you add new migrations or want to rollback previous one you can always follow the above mentioned procedure like:
+```bash
+$ docker-compose exec app bundle exec rails db:migrate
+```
+OR
+```bash
+$ docker-compose run --rm app bundle exec rails db:migrate
+```
+
+### To receive the emails in non-production apps.
+
+Go to `/sent_emails` for accessing the emails(for `/sent_emails` route to work,
+add `EMAIL_DELIVERY_METHOD='letter_opener_web'` to `.env`)
+
+### User Test credentials
+
+| Role     | Email               | Password |
+| -------- | ------------------- | -------- |
+| Owner    | vipul@example.com   | password |
+| Admin    | supriya@example.com | password |
+| Employee | akhil@example.com   | password |