Update ezgzip.opam to make dune-release happy

Author: hcarty

ezgzip.opam

@@ -3,6 +3,31 @@ maintainer: "Hezekiah M. Carty <[email protected]>"
 authors: [ "Hezekiah M. Carty <[email protected]>" ]
 license: "MIT"
 synopsis: "Simple gzip (de)compression library"
+description: """
+# ezgzip - Simple gzip (de)compression library
+
+ezgzip is a simple interface focused on `string -> string` zlib and gzip
+(de)compression.
+
+Documentation is available
+[here](https://hcarty.github.io/ezgzip/ezgzip/index.html).
+
+An example illustrating how to gzip compress and then decompress a string:
+```ocaml
+open Rresult
+
+let () =
+  let original = "Hello world" in
+  let compressed = Ezgzip.compress original in
+  let decompressed = R.get_ok (Ezgzip.decompress compressed) in
+  assert (original = decompressed)
+```
+
+This library currently uses the zlib bindings provided by
+[camlzip](https://github.com/xavierleroy/camlzip).  The gzip header/footer code
+is based on the
+[upstream specification](http://www.gzip.org/zlib/rfc-gzip.html#specification).
+"""
 homepage: "https://github.com/hcarty/ezgzip"
 dev-repo: "git+https://github.com/hcarty/ezgzip.git"
 bug-reports: "https://github.com/hcarty/ezgzip/issues"