Add direnv support & gitignore

template/.envrc

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+use flake

template/.gitignore

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+# standard haskell gitignore
+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.hie
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+cabal.project.local~
+.HTF/
+.ghc.environment.*
+
+# ignore vscodium's local config
+.vscode/
+
+# ignore nix build system
+result*
+.direnv