Add info about git, docker, and docker-compose versions in README.md

Signed-off-by: J. Manrique Lopez de la Fuente <jsmanrique@bitergia.com>

README.md

@@ -15,7 +15,15 @@ to analyze git activity for this repository. Given such set up, there are severa
 ## Using `docker-compose`
 
 Requirements: 
-* Software:[git](https://git-scm.com/), [docker client](https://docs.docker.com/install/), and [docker compose](https://docs.docker.com/compose/install/)
+* Software:[git](https://git-scm.com/), [docker client](https://docs.docker.com/install/), and [docker compose](https://docs.docker.com/compose/install/). As an example of working configuration:
+```console
+root@test-68b8628f:~# git --version
+git version 2.17.1
+root@test-68b8628f:~# docker --version
+Docker version 19.03.1, build 74b1e89
+root@test-68b8628f:~# docker-compose --version
+docker-compose version 1.22.0, build f46880fe
+```
 * Hardware: 2 CPUs, 8GB memory RAM and [enough virtual memory for Elasticsearch](https://www.elastic.co/guide/en/elasticsearch/reference/current/vm-max-map-count.html) 
 
 Steps:
@@ -36,7 +44,13 @@ More details in the [docker-compose folder](./docker-compose/README.md).
 ## Using `docker run`
 
 Requirements: 
-* Software: [git](https://git-scm.com/), and [docker client](https://docs.docker.com/install/)
+* Software: [git](https://git-scm.com/), and [docker client](https://docs.docker.com/install/). As an example of working configuration:
+```console
+root@test-68b8628f:~# git --version
+git version 2.17.1
+root@test-68b8628f:~# docker --version
+Docker version 19.03.1, build 74b1e89
+```
 * Hardware: 2 CPUs, 8GB memory RAM and set 
 
 Steps: