Added script that fends and prints the versions

Given the fast rate of change many users will be changing and experimenting with different versions of the nodes.

This is a small script to help an unfamiliar new user find and see the variables that affect the versioning.

code/docker/check-versions.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# a small script to help sanity check the versions of the different node implementations
+dockerfiles=$(find . -name 'Dockerfile')
+# print location of dockerfiles
+echo $dockerfiles
+# print variables
+awk '/ENV/ && /VER|COMMIT/' $dockerfiles