Updated README

README.md

+# Getting Started with Rails, Docker
+## Usage
+*  Clone this repository
+
+```bash
+# via SSH
+git clone ssh://git@gitlab.discs.ateneo.edu:15316/mis-21-2018-intersession/1-getting-started-with-rails.git sample_app
+
+# via HTTP
+git clone https://gitlab.discs.ateneo.edu/mis-21-2018-intersession/1-getting-started-with-rails.git sample_app
+```
+**Note**: You can replace the name of the project e.g. ``sample_app`` to any preferred project name.
+
+* Go inside the cloned repository
+
+```bash
+cd sample_app
+```
+
+* Make sure that the ``start`` file is executable.
+
+```bash
+chmod +x start
+```
+
+* Build and start Docker containers
+
+```bash
+docker-compose build
+docker-compose up
+```
+
+* Open another Terminal (Mac/Unix) / Powershell (Windows)
+* Stop Docker containers
+
+```bash
+docker-compose down
+```
+
+* Create a new Rails project
+
+```bash
+docker-compose run web rails new . --force --database=postgresql
+```
+**Notes**: You can remove ``--database=postgresql`` if a different database engine will be used.
+
+* Start again Docker containers
+
+```bash
+docker-compose up
+```
+
+* Create the ``development`` and ``test`` database
+
+```bash
+docker-compose run web rails db:create
+```
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