Add opam file as well

Author: k4rtik

openQASM.opam

@@ -0,0 +1,29 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "Parser for OpenQASM (Open Quantum Assembly Language)"
+description: "Parser for OpenQASM (Open Quantum Assembly Language)"
+maintainer: ["kartiksinghal@gmail.com"]
+authors: ["Kartik Singhal"]
+license: "ISC"
+homepage: "https://github.com/k4rtik/openqasm-parser"
+doc: "https://k4rtik.github.io/openqasm-parser"
+bug-reports: "https://github.com/k4rtik/openqasm-parser/issues"
+depends: [
+  "dune" {> "1.5"}
+  "menhir" {>= "20190626"}
+]
+build: [
+  ["dune" "subst"] {pinned}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/k4rtik/openqasm-parser.git"