Add cabal.project to ease using cabal-install instead of stack

.gitignore

@@ -4,6 +4,7 @@ cereal-utils.cabal
 ghc-toolkit.cabal
 binaryen.cabal
 wasm-toolkit.cabal
+dist-newstyle/
 site/
 .idea/
 node_modules/

cabal.project

@@ -0,0 +1,25 @@
+packages: asterius/
+          binaryen/
+          genapply/
+          ghc-toolkit/
+
+package hashable
+  flags: -integer-gmp
+
+allow-newer: all
+
+constraints: ansi-terminal == 0.8.0.4,
+             ansi-wl-pprint == 0.6.8.2,
+             base-compat == 0.10.1,
+             cereal == 0.5.5.0,
+             colour == 2.3.4,
+             happy == 1.19.9,
+             hashable == 1.2.7.0,
+             haskell-lexer == 1.0.1,
+             mintty == 0.1.2,
+             optparse-applicative == 0.14.2.0,
+             pretty-show == 1.7,
+             primitive == 0.6.4.0,
+             transformers-compat == 0.6.2,
+             unordered-containers == 0.2.9.0,
+             vector == 0.12.0.1