Added mac installation instructions (fixes #6)

Author: macro1

part-0.ipynb

@@ -116,10 +116,29 @@
       "```"
      ]
     },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "OS X"
+     ]
+    },
     {
      "cell_type": "markdown",
      "metadata": {},
-     "source": []
+     "source": [
+      "You need to go to the website https://www.python.org/downloads/release/python-341/ and download the Python installer:\n",
+      "- download the Mac OS X 64-bit/32-bit installer DMG file,\n",
+      "- double click to open it,\n",
+      "- double click Python.mpkg to run the installer.\n",
+      "\n",
+      "Verify the installation was successful by opening the Terminal application and running the python3 command:\n",
+      "```\n",
+      "$ python3 --version\n",
+      "Python 3.4.1\n",
+      "```"
+     ]
     }
    ],
    "metadata": {}