Add docker wrapper to be able to use it as a cli tool without direct installation on the host

Dockerfile

@@ -0,0 +1,7 @@
+FROM node:alpine
+WORKDIR /usr/src/app
+COPY . /usr/src/app
+RUN npm install && npm run release
+WORKDIR /src
+ENTRYPOINT [ "node", "/usr/src/app/bin/index.js" ]
+CMD "--help"

README.md

@@ -58,6 +58,20 @@ $ openapi --help
     $ openapi --input ./spec.json --output ./generated --client xhr
 ```
 
+## Docker usage
+
+* Help screen
+
+  ```
+  docker run leeelenbaas/openapi-typescript-codegen --help
+  ```
+
+* Generate client for `sample.yaml` in current folder to the `client` subfolder
+
+  ```
+  docker run -v "$PWD:/src" leeelenbaas/openapi-typescript-codegen -i sample.yaml -o client
+  ```
+
 Documentation
 ===
 - [Basic usage](docs/basic-usage.md)

package.json

@@ -56,7 +56,8 @@
         "eslint": "eslint .",
         "eslint:fix": "eslint . --fix",
         "prepublishOnly": "npm run clean && npm run release",
-        "codecov": "codecov --token=66c30c23-8954-4892-bef9-fbaed0a2e42b"
+        "codecov": "codecov --token=66c30c23-8954-4892-bef9-fbaed0a2e42b",
+        "docker": "docker build -t eeelenbaas/openapi-typescript-codegen ."
     },
     "dependencies": {
         "camelcase": "^6.3.0",