Added main README for project.

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+# Overview #
+
+This repository contains personal notes and experiments related to the book
+Surreal Numbers written by Donald Knuth.
+
+
+# Status #
+
+Everything has been tested to compile and run on Debian 10.9.
+
+
+# Instructions #
+
+See the `Makefile` and `README.md` in individual subdirectories.
+