Add native build and compiler driver

README.md

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+# delta
+
+OCaml compiler for a small pure functional language of keyed collection
+queries
+
+Collections are unordered finite maps from signed machine integers to values.
+`map` preserves keys; `filter` keeps the keys of the rows it retains. Results
+are printed in key order, so presentation is deterministic
+
+## Language
+
+```ocaml
+type order = {
+  customer : string;
+  total : int;
+}
+
+input orders : collection order
+
+let tax n = n * 20 / 100
+
+query expensive_orders =
+  orders
+  |> filter (fun o -> o.total > 1000)
+  |> map (fun o -> (o.customer, tax o.total))
+```