Add README

Author: gjbex

source-code/README.md

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+# Source code
+
+This is source code that is either used in the presentation, or was developed
+to create it.  There is some material not covered in the presentation as well.
+
+## Requirements
+
+* Python version: at least 3.6
+* Packages (names listed that can be used with `pip` or `conda` to install):
+  * jinja2
+  * jupyter
+  * matplotlib
+  * numpy
+  * paramiko
+  * psutil
+  * python=3.7.5
+  * sh
+  
+## What is it?
+
+1. `cmd`: illustration of how to create a repl application.
+1. `code-evaluation`: illustrates how to evaluate a string containing
+    Python code at runtime.
+1. `command-Line-args`: illustration of how to use the argparse and the
+    click module to handle command line arguments.
+1. `config-parser`: illustrates how to use the ConfigParser module to handle
+    configuration files.
+1. `data-formats`: illustrates how to deal with data formats such as CSV
+    files, binary data and XML.
+1. `hydra`: Facebook Hydra application framework illustration.
+1. `logging`: illustration of Python's logging facilities.
+1. `file-system`: illustrations of interacting with the operating system
+    and the file system.
+1. `paramiko`: a few examples of using the Paramiko library for SSH
+    to remote hosts.
+1. `Sched`: scheduled execution of funcitons in Python.
+1. `Subprocess`: illustrates executing a shell command from a Python script
+    using the `subprocess` module.
+1. `xml-generator`: code to generate a random XML documents.