[ADD] docker init : README.md for docker

docker/README.md

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+# ERPLibre - Docker
+
+Those image are prepare to permit better portability and reproducibility of ERPLibre release.
+
+Due the the growing code of ERPLibre, it could also simplify developpement.
+
+NOTE : Those Dockerfile themselve are in heavy developpement for now. Incompatibilities between release are normal until the interfaces will be stabilized.
+
+
+## Pre-requierments
+
+- Basic knownledge with Docker, Linux and bash
+- Latest Docker version
+
+## Files representations
+
+- Dockerfile.base : This Dockerfile represent the base Docker image layer reused by other child layersé
+- Dockerfile.dev : This Dockerfile is specialized in developpement.
+- Dockerfile.prod{pkg,src} : Dockerfile.prod.\* is a Docker image specialized for production systems. Dockerfile.prod.pkg reuse official debian files from Odoo.com. Dockerfile.prod.src fetch the Odoo source code as the ERPLibre runtime.
+
+
+## Getting started
+
+### Building the dockerimages
+
+- docker build -f Dockerfile.base -t technolibre/erplibre-base:12.0 .
+- docker build -f  Dockerfile.prod.pkg  .
+
+
+### Running ERPLibre using Docker-Compose
+
+1. Go at the root of this git project. Ex : `cd ERPLibre` 
+2. docker-compose -f docker-compose.yml up