Docs: guide on serverless configuration (#63)

* Docs: guide on serverless configuration

docs/guides/03_configuring-quantum-serverless.ipynb

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+{
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+   "source": [
+    "# Guide: configuring quantum serverless\n",
+    "\n",
+    "In order to use `QuantumServerless` with non-local resources, you need to configure `QuantumServerless` to work with them.\n",
+    "It is easy to do with constructor arguments.\n",
+    "\n",
+    "Let's see how to do that."
+   ],
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+   "source": [
+    "First option is to pass configuration to constructor of `QuantumServerless`\n",
+    "\n",
+    "```python\n",
+    "serverless = QuantumServerless({\n",
+    "\t\"providers\": [{\n",
+    "\t\t\"name\": \"my_provider\",  # name of provider\n",
+    "\t\t\"cluster\": { # main computational resource\n",
+    "\t\t\t\"name\": \"my_cluster\", # name of cluster\n",
+    "\t\t\t\"host\": \"HOST_ADDRESS_OF_CLUSTER_HEAD_NODE\", # host address of cluster, if you are using helm it will be DEPLOYMENT_NAME-kuberay-head-svc\n",
+    "\t\t\t\"port\": 10001 # port to connect\n",
+    "\t\t}\n",
+    "\t}]\n",
+    "})\n",
+    "```"
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "Other option will be creating instance from configuration file, which has exactly the same structure as example above\n",
+    "\n",
+    "Example of `config.json`\n",
+    "```json\n",
+    "{\n",
+    "\t\"providers\": [{\n",
+    "\t\t\"name\": \"my_provider\",\n",
+    "\t\t\"cluster\": {\n",
+    "\t\t\t\"name\": \"my_cluster\",\n",
+    "\t\t\t\"host\": \"HOST_ADDRESS_OF_CLUSTER_HEAD_NODE\",\n",
+    "\t\t\t\"port\": 10001\n",
+    "\t\t}\n",
+    "\t}]\n",
+    "}\n",
+    "```\n",
+    "\n",
+    "Then load this file\n",
+    "\n",
+    "```python\n",
+    "serverless = QuantumServerless.load_configuration(\"./config.json\")\n",
+    "```"
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "You can use it now\n",
+    "\n",
+    "```python\n",
+    "with serverless.provider(\"my_provider\"):\n",
+    "    ...\n",
+    "```"
+   ],
+   "metadata": {
+    "collapsed": false
+   }
+  }
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