Add more information to the README

README.md

@@ -1,5 +1,16 @@
 # Wipforth
 
+Wipforth is a simple Forth implementation that runs in the WebAssembly
+virtual machine.  It does I/O via memory-mapped peripherals, which are
+emulated in JavaScript.
+
+- For the Forth kernel, see [wipforth.wat](./wipforth.wat)
+- For the JavaScript emulator, see [emu.js](./emu.js)
+- For the Forth prelude, which is loaded at start-up, see
+  [prelude.f](./prelude.f)
+- For a description of the peripherals, see the
+  [Peripherals](#peripherals) section below.
+
 ## Building and Running
 
 To run, first compile the WebAssembly module: