Add Haskell MVP BFF with mutation protocol and local compose stack.

.gitignore

@@ -1,5 +1,32 @@
+# Development scratchpad and journal (external repos)
+scratchpad
+docs/journal
+
+# TLC working directories
 /docs/protocol/states/
 /states/
+
+# Kind fixture runtime
 /tests/kind/.runtime/
-docs/journal
-scratchpad
+
+# Cabal / GHC
+/dist-newstyle/
+/dist/
+/cabal.project.local
+/cabal.project.local~
+/.ghc.environment.*
+/*.eventlog
+/*.prof
+/*.hp
+/*.ps
+/*.aux
+
+# Local env
+.env
+.env.*
+!.env.example
+
+# Editor / OS noise
+*~
+*.swp
+.DS_Store