README: specify lang for src blocks

README.md

@@ -38,7 +38,7 @@ All the scripts are written in POSIX Shell. I hope they are easy enough and stru
 
 You can use these docker images for developing the software. This repo is targeted on integrating, deploying and testing the IdHub tools. You can do the same with the other tools, the trick used is to override the docker's directory with a local directory. Example found on all pilots instances
 
-```
+```yaml
     volumes:
       - ./idhub1__pilot-example:/opt/idhub
 ```
@@ -51,13 +51,13 @@ In the `.env` there are some variables intended to be used for debugging purpose
 
 if you want to enter a shell inside a new container:
 
-```
+```sh
 docker run -it --entrypoint= ${target_docker_image} bash
 ```
 
 if you want to enter a shell on already running container:
 
-```
+```sh
 docker exec -it ${target_docker_image} bash
 ```