add fourmolu.yaml

fourmolu.yaml

@@ -0,0 +1,17 @@
+column-limit: 100
+comma-style: leading
+fixities: []
+function-arrows: trailing
+haddock-style: single-line
+haddock-style-module: null
+import-export-style: diff-friendly
+in-style: right-align
+indent-wheres: true
+indentation: 2
+let-style: inline
+newlines-between-decls: 1
+record-break-space: true
+reexports: []
+respectful: true
+single-constraint-parens: never
+unicode: detect