add generic shell.nix

diff --git a/shell.nix b/shell.nix
new file mode 100644 (file)
index 0000000..03dd09c
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,2 @@
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc822" }:
+(import ./default.nix { inherit nixpkgs compiler; }).env