added docker-service plugin

Author: kosta-codefresh

incubator/docker-service/README.md

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+# Codefresh docker-service plugin
+
+Use Codefresh docker-service plugin to create docker daemon and then use run on it any of 
+`docker build|run|...` or `docker-compose` on your repository
+
+## codefresh/docker-service Docker Image details
+includes `docker`, `docker-machine` and `docker-compose`
+
+`docker-service-create` command accepts same parameters as `docker-machine create` (i.e --driver , --engine-opt, etc) and starts a docker daemon
+on a provider specified by "--driver" parameter - see https://docs.docker.com/machine/reference/create/
+Then it saves docker-machine environment files to Codefresh Volume, so every `docker` command will use this created docker daemon
+
+`docker-service-delete` command deletes all previously created docker-machine environment
+
+
+## Usage
+
+Set environment variable and add the following step to your Codefresh pipeline:
+
+```yaml
+---
+version: '1.0'
+
+steps:
+
+  ...
+
+  # 
+  create-my-docker:
+    image: codefresh/docker-service
+    commands: 
+        - docker-service-create  --driver amazonec2 --amazonec2-instance-type m4.large my-docker
+    
+  build-on-my-docker:
+    image: codefresh/docker-service
+    commands:
+        - docker build -t mycompany/repo:${{CF_BRANCH}} ${{CF_VOLUME_PATH}}/
+
+  run-on-my-docker:
+    image: codefresh/docker-service
+    commands:
+        - docker run -d mycompany/repo:${{CF_BRANCH}}
+        
+  delete-my-docler:
+     image: codefresh/docker-service
+     commands:
+        - docker-service-delete my-docker
+
+  ...
+
+```
+## Environment Variables
+
+- DOCKER_MACHINE_NAME
+- Codefresh variables: https://docs.codefresh.io/docs/variables

incubator/docker-service/plugin.yaml

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+image: codefresh/docker-service
+tag: master
+version: 0.1.0
+description: Codefresh docker-service plugin
+keywords:
+  - docker
+  - docker-machine
+  - docker-compose
+home: https://github.com/codefresh-io/docker-service
+sources:
+  - https://github.com/codefresh-io/docker-service
+maintainers: # (optional)
+  - name: Kosta Klevensky
+    email: kosta@codefresh.io