dy/c-to-wasm.md

## c-to-wasm.md

      
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              c-to-wasm.md
            
          
    Convert C file to wasm, example: https://github.com/jdh8/metallic
clang --target=wasm32 -pipe -O3 -Wall -flto  -I path/to/include -c ./pow.c -o ./pow.o 
llvm-lto ./pow.o -o ./pow.wasm --exported-symbol=pow
wasm2wat -f ./pow.wasm 

Note: can use https://webassembly.github.io/wabt/demo/wasm2wat/ to convert back to text.
Note: that for .h files you may want to create wrappers.