pythonPackages.gym: init at 0.9.6

Fix the description and add the comment

pkgs/development/python-modules/gym/default.nix

@@ -0,0 +1,28 @@
+{ lib
+, buildPythonPackage, fetchPypi
+, numpy, requests, six, pyglet, scipy
+}:
+
+buildPythonPackage rec {
+  pname = "gym";
+  version = "0.9.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0llbhn3zdlsz2crd5grd1yygg8zp2shsclc24iqix5gw5f65clx5";
+  };
+
+  propagatedBuildInputs = [
+    numpy requests six pyglet scipy
+  ];
+
+  # The test needs MuJoCo that is not free library.
+  doCheck = false;
+
+  meta = with lib; {
+    description = "A toolkit by OpenAI for developing and comparing your reinforcement learning agents.";
+    homepage = https://gym.openai.com/;
+    license = licenses.mit;
+    maintainers = with maintainers; [ hyphon81 ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -2448,6 +2448,8 @@ in {
 
   gspread = callPackage ../development/python-modules/gspread { };
 
+  gym = callPackage ../development/python-modules/gym { };
+
   gyp = callPackage ../development/python-modules/gyp { };
 
   guessit = callPackage ../development/python-modules/guessit { };