Added Docker support and example drone.io config

Dockerfile

@@ -0,0 +1,11 @@
+FROM alpine
+
+MAINTAINER Alexander Zierhut <info@zierhut-it.de>
+LABEL maintainer="info@zierhut-it.de"
+
+RUN apk add --no-cache git composer openssl php-common php-bcmath php-json php-mbstring php-tokenizer
+
+WORKDIR /obfuscate
+RUN git clone https://github.com/naneau/php-obfuscator . && composer install
+
+ENTRYPOINT ["/obfuscate/bin/obduscate" "obfuscate"]

README.md

@@ -45,3 +45,18 @@ You can run the obfuscator with a configuration file through
 ```bash
 ./bin/obfuscate obfuscate /input/directory /output/directory --config=/foo/bar/config.yml
 ```
+
+## Docker Support
+### Usage
+There is a docker image of this project. You could use it to implement obfuscation into your CI processes. It can be found <a href="https://hub.docker.com/repository/docker/zierhutit/naneau-php-obfuscator/general">here</A>. It is called `zierhutit/naneau-php-obfuscator/`.
+
+### Drone CI
+Example Configuration:
+```YAML
+- name: Obfuscation
+  image: zierhutit/naneau-php-obfuscator
+  commands: 
+    - mkdir /drone/src-tmp
+    - cp -rf /drone/src/* /drone/src-tmp
+    - /obfuscate/bin/obfuscate obfuscate /drone/src-tmp /drone/src
+```