Update README

Add list of tools installed. This is something that should get automated
and then tag releases and put the info in there, honestly.

Author: smerrell

README.md

@@ -1,5 +1,17 @@
 # Terraform Python Build
 
-This Docker image uses the zenika/terraform-azure-cli Docker image as a base and
-adds Python3 and some pip packages to allow for a Python build script to be
-used.
+This Docker image uses the
+[zenika/terraform-azure-cli](https://github.com/Zenika/terraform-azure-cli)
+Docker image as a base and adds Python3 and some pip packages to allow for a
+Python build script to be used.
+
+## Installed Tools
+
+* Make
+* Git
+* Python 3.7
+
+### Python Tools
+
+* [gitpython](https://pypi.org/project/GitPython/)
+* [python-terraform](https://pypi.org/project/python-terraform/)