much longer readme

Author: bjourne

README.md

@@ -1,5 +1,32 @@
 # python3-libs
-Python3 library code I have written. Run the unit tests using:
+
+This repository contains Python code I have written. Originally, I
+thought I should have repositories both for Python 2 and Python 3, but
+since I only code in Python 3 nowadays, one repository was enough.
+
+## Packages
+
+Each package is in its own directory:
+
+### ccrap
+
+A work in progress C code generator for a concatenative language.
+
+### learning
+
+Modules for machine learning tasks.
+
+### programs
+
+Random programs.
+
+### tools
+
+Random modules.. Useful (I promise!) but random.
+
+## Testing
+
+Run the unit tests using:
 
     python3 -m pytest