Add Docker support (#393)

* Implements Docker and Docker Compose support

* Update the README file with usage instructions
* Add the files Dockerfile, docker-compose.yml and .dockerignore

* Change Docker image version from 0.1.0 to latest

.dockerignore

@@ -0,0 +1,3 @@
+Packages
+.build
+

Dockerfile

@@ -0,0 +1,12 @@
+FROM vapor/vapor:1.0.9-xenial
+
+WORKDIR /app
+
+COPY ./ ./
+
+RUN vapor build
+
+EXPOSE 8080
+
+# CMD vapor run
+

README.md

@@ -203,6 +203,16 @@ $ vapor build
 $ vapor run
 ```
 
+### Using Docker
+
+It's also possible to run the app using [Docker](https://www.docker.com/) and [Docker Compose](https://docs.docker.com/compose/). It can be done by running the commands below.
+
+```sh
+$ git clone --recursive git@github.com:joeblau/gitignore.io.git
+$ cd gitignore.io/
+$ docker-compose up -d
+```
+
 ## Companies
 
 Here are some companies that use gitignore.io:

docker-compose.yml

@@ -0,0 +1,11 @@
+version: "3.5"
+
+services:
+  app:
+    image: gitignore-io:latest
+    build:
+      context: ./
+      dockerfile: Dockerfile
+    ports:
+      - "8080:8080"
+    command: vapor run