start a vool readme

lib/vool/README.md

@@ -0,0 +1,31 @@
+# VOOL
+
+Virtual Object Oriented Language
+
+in other words, ruby without the fluff.
+
+Possibly later other languages can compile to this level, eg by running in the same jvm.
+
+## Syntax tree
+
+Vool is the layer of concrete syntax tree. The Parser gem is used to parse ruby. It creates
+an abstract syntax tree which is then transformed.
+
+The next layer down is the Vom, Virtual object Machine, which uses an instruction tree.
+That is on the way down we create instructions, but stay in tree format. Only the next step
+down to the Risc layer moves to an instruction stream.
+
+The nodes of the syntax tree are all the things one would expect from a language, if statements
+and the like. There is no context yet, and actual objects, representing classes and
+methods, will be created on the way down.
+
+## Fluff
+
+Ruby has lots of duplication to help programmers to write less. An obvious example is the
+existence of until, which really means if not. Other examples, some more impactful are:
+
+- No implicit blocks, those get passed as normal arguments (the last)
+- No splats
+- no case
+- no elseif (no unless, no ternary operator)
+- no global variables.