Add grammar to readme.

jorendorff · Aug 21, 2013 · 60eb90b · 60eb90b
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 Toy calculator for my talk on compilers at Coderfaire 2013.
 [Try it out.](http://jorendorff.github.io/calc/calculator.html)
+
+
+The grammar is:
+
+    PrimaryExpr:
+        Number
+        Name
+        ( Expr )
+
+    MulExpr :
+        NegExpr
+        NegExpr * NegExpr ...
+        NegExpr / NegExpr ...
+
+    Expr :
+        MulExpr
+        MulExpr + MulExpr
+        MulExpr - MulExpr
+