readme update

Readme.md

@@ -3,3 +3,15 @@
 An exercise on making the simplest useful parser with different languages or conventions.
 
 The C code conveys a convention for doing C I've synthesized after studying how several people in the "handmade" community have written their exposed libraries or codebases.
+
+The goal of the exercise is always the following:
+```odin
+start:
+    file_contents := file.read_contents(self.source)
+    tokens        := watl.lex(file_contents)
+    str_cache     := str.cache.init()
+    lines         := watl.parse(tokens)
+    listing       := watl.dump_listing(lines)
+    file.write_str(str_fmt("<name>.listing.source", self.source.name))
+end
+```