Add some documentation for wasm2c (#803)

Also remove `WASM_RT_DEFINE_EXTERNAL`, as it doesn't seem to be used.

1 files changed, 4 insertions, 0 deletions

diff --git a/README.md b/README.md
index 20899615..19ff1c5d 100644
--- a/README.md
+++ b/README.md
@@ -205,6 +205,10 @@ You can use `-h` to get additional help:
 $ out/wasm-interp -h
 ```
 
+## Running wasm2c
+
+See [wasm2c.md](wasm2c.md)
+
 ## Running the test suite
 
 See [test/README.md](test/README.md).