Add OPAM description

pringo.opam

@@ -0,0 +1,16 @@
+opam-version: "2.0"
+name: "pringo"
+version: "1.0"
+synopsis: "Pseudo-random, splittable number generators"
+description:
+  "Pseudo-random number generators that support splitting and two interfaces: one stateful, one purely functional"
+maintainer: "Xavier Leroy <[email protected]>"
+authors: "Xavier Leroy <[email protected]>"
+license: "GPL v2 with static linking exception"
+homepage: "https://github.com/xavierleroy/pringo"
+bug-reports: "https://github.com/xavierleroy/pringo/issues"
+depends: ["ocamlfind"]
+build: make
+install: [make "install"]
+remove: [make "uninstall"]
+dev-repo: "git+https://https://github.com/xavierleroy/pringo"