add .ocamlformat

.ocamlformat

+version=0.19.0
+align-cases=false
+align-constructors-decl=false
+align-variants-decl=false
+assignment-operator=end-line
+break-before-in=fit-or-vertical
+break-cases=all
+break-collection-expressions=fit-or-vertical
+break-fun-decl=wrap
+break-fun-sig=wrap
+break-infix=wrap
+break-infix-before-func=false
+break-separators=before
+break-sequences=true
+break-string-literals=auto
+break-struct=force
+cases-exp-indent=2
+cases-matching-exp-indent=normal
+disambiguate-non-breaking-match=false
+doc-comments=before
+doc-comments-padding=2
+doc-comments-tag-only=default
+dock-collection-brackets=false
+exp-grouping=preserve
+extension-indent=2
+field-space=loose
+function-indent=2
+function-indent-nested=never
+if-then-else=k-r
+indent-after-in=0
+indicate-multiline-delimiters=space
+indicate-nested-or-patterns=unsafe-no
+infix-precedence=indent
+leading-nested-match-parens=false
+let-and=sparse
+let-binding-indent=2
+let-binding-spacing=compact
+let-module=compact
+margin=80
+match-indent=0
+match-indent-nested=never
+max-indent=68
+module-item-spacing=sparse
+nested-match=wrap
+ocp-indent-compat=false
+parens-ite=false
+parens-tuple=always
+parens-tuple-patterns=multi-line-only
+parse-docstrings=true
+sequence-blank-line=preserve-one
+sequence-style=terminator
+single-case=compact
+space-around-arrays=true
+space-around-lists=true
+space-around-records=true
+space-around-variants=true
+stritem-extension-indent=0
+type-decl=sparse
+type-decl-indent=2
+wrap-comments=false
+wrap-fun-args=true