Add some platform documentation

While trying things out I made a some notes about the various parts of the SoC, and how the registers and memory are laid out. It's unlikely that everything is correct but I think it's at least a start of more complete platform documentation.
dan-rodrigues · Nov 22, 2020 · 8e1c661 · 8e1c661
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diff --git a/README.md b/README.md
@@ -96,6 +96,10 @@ make ulx3s_prog
 
 Note that fujprog can be slow to flash larger files. Programming over WiFi [using the ESP32](https://github.com/emard/esp32ecp5) can be done as a faster alternative.
 
+### Programming documentation
+
+More detailed hardware documentation for the platform can be found in [doc/platform.md](doc/platform.md).
+
 ### Running simulator (Verilator or CXXRTL, plus SDL2)
 
 A simulator using SDL2 and its documentation is included in the [/simulator](simulator/) directory.