Add grammar.lua file that I forgot to add in the last commit.
tree17f5019343e39469b9c4aba850eb4778d128dead
-rw-r--r-- 3414 BIBLIOGRAPHY
-rw-r--r-- 1763 FILEFORMAT
-rw-r--r-- 1483 LICENSE
-rw-r--r-- 906 Makefile
-rw-r--r-- 2108 README
drwxr-xr-x - compiler
drwxr-xr-x - docs
drwxr-xr-x - lang_ext
drwxr-xr-x - runtime
drwxr-xr-x - sketches
drwxr-xr-x - tests
drwxr-xr-x - utilities