Update readme with info about building regularly.

README.md

 # ch32v003fun
-My tests for the CH32V003
+
+My tests for the CH32V003 with gcc-riscv64
+
+This contains:
+1. EVT Folder for running demos from the ch32v003 EVT.
+2. Barebones. For compiling without the EVT.
+
+## System Prep
+
+On WSL or Debian based OSes `apt-get install build-essential libnewlib-dev gcc-riscv64-unknown-elf`
+
+## Running
+
+```
+cd barebones
+make
+```
+
+Use the WCH-LinkUtility to flash the built hex file.
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