fix opam file and add install steps to README

README.md

@@ -0,0 +1,6 @@
+## 2022 AOC problems in Ocaml 
+
+```sh
+$ opam switch create . --deps-only -y
+$ dune build
+```

aoc.opam

@@ -12,6 +12,16 @@ bug-reports: "https://github.com/username/reponame/issues"
 depends: [
   "ocaml"
   "dune" {>= "3.10"}
+  "re"
+  "containers"
+  "iter"
+  "dune-site"
+  "angstrom"
+  "ppx_deriving"
+  "ppx_deriving_hash"
+  "ppx_regexp"
+  "ppx_expect"
+  "ppx_inline_test"
   "odoc" {with-doc}
 ]
 build: [

dune-project

@@ -21,7 +21,19 @@
  (name aoc)
  (synopsis "A short synopsis")
  (description "A longer description")
- (depends ocaml dune)
+ (depends
+   ocaml
+   dune
+   re
+   containers
+   iter
+   dune-site
+   angstrom
+   ppx_deriving
+   ppx_deriving_hash
+   ppx_regexp
+   ppx_expect
+   ppx_inline_test)
  (sites (lib inputs))
  (tags
   (topics "to describe" your project)))