add .ocamlformat

Author: RCmerci

.ocamlformat

@@ -0,0 +1,18 @@
+version=0.16.0
+break-separators=before
+dock-collection-brackets=false
+break-sequences=true
+doc-comments=before
+field-space=loose
+let-and=sparse
+sequence-style=terminator
+type-decl=sparse
+wrap-comments=false
+if-then-else=k-r
+let-and=sparse
+space-around-records
+space-around-lists
+space-around-arrays
+cases-exp-indent=2
+break-cases=all
+indicate-nested-or-patterns=unsafe-no

makefile

@@ -11,12 +11,14 @@ test:
 	$(DUNE) runtest
 
 clean:
-	rm -rf _build
-
+	dune clean
 run:
 	$(DUNE) exec ./bin/main.exe
 
 bench:
 	$(DUNE) exec ./bench/bench.exe
 
-.PHONY: pin test all clean check bench
+fmt:
+	dune build @fmt --auto-promote
+
+.PHONY: pin test all clean check bench fmt