builds readme

Author: eiximenis

build/azure-devops/readme.md

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+# Azure Devops build definitions
+
+This folder contains the Azure Devops build definitions in YAML format. Each folder contains one `azure-pipelines.yml` that contains the build definition for one microservice (usually a Docker image, but some microservices generates more than one Docker image).
+
+For more information about YAML builds read the [Azure DevOps documentation](https://docs.microsoft.com/en-us/azure/devops/pipelines/get-started-yaml?view=azure-devops).