Add a basic README.

README.md

@@ -1 +1,24 @@
-# winprom
+# WinProm
+
+WinProm is a Windows tool for calculating the topographic prominence
+of mountains.  It was written by Edward Earl, a pioneer in prominence
+research and calculation.
+
+## Building the code
+
+WinProm compiles with Microsoft Visual Studio 2015 Community Edition.
+You can download it for free from Microsoft's Web site.  Be sure to
+install the Visual C++ compiler and the MFC libraries; these are not
+installed by default.
+
+## About prominence
+
+There are many good articles about topographic prominence on the Web.
+For an introduction, see
+
+https://en.wikipedia.org/wiki/Topographic_prominence
+http://www.surgent.net/highpoints/prominence.html
+
+## About Edward Earl
+
+For more about Edward, see http://peakbagger.com/climber/climber.aspx?cid=601.