Add minimum versions.

Author: jason-fox

docs/index.md

@@ -99,19 +99,20 @@ FIWARE Postman collections can be downloaded directly from the
 [Gitpod](https://github.com/gitpod-io/gitpod) is an open-source Kubernetes application for ready-to-code cloud
 development environments that spins up an automated dev environment for each task, in the cloud. It enables you to run
 the tutorials in a cloud development environment directly from your browser or your Desktop IDE.
+The default environment is based on Ubuntu and includes Java `11.0.16`  and Maven `3.8.6`.
 
 ### Apache Maven <img src="https://maven.apache.org/favicon.ico" align="left"  height="30" width="30" style="border-right-style:solid; border-right-width:10px; border-color:transparent; background: transparent">
 
 [Apache Maven](https://maven.apache.org/download.cgi) is a software project management and comprehension tool. Based on
 the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a
 central piece of information. Maven can be used to define and download our dependencies and to build and package Java or
-Scala code into a JAR file.
+Scala code into a JAR file. Apache Maven `3.8.6` or higher is recommended.
 
 ### JQ <img src="https://jqlang.github.io/jq/jq.png" align="left"  height="30" width="30" style="border-right-style:solid; border-right-width:10px; border-color:transparent; background: transparent">
 
 [jq](https://jqlang.github.io/jq/) is a lightweight and flexible command-line JSON processor which can be used to format
 the JSON responses received from the context broker and other FIWARE components. More information about how to use jq
-can be found [here](https://www.digitalocean.com/community/tutorials/how-to-transform-json-data-with-jq)
+can be found [here](https://www.digitalocean.com/community/tutorials/how-to-transform-json-data-with-jq). `jq-1.6` is recommended.
 
 ## Data models