adding notebook with OSSR global stats

examples/notebooks/ossr_statistics.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "457f7641",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from eossr.api import get_ossr_records\n",
+    "from IPython.display import Markdown as md\n",
+    "from datetime import date"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "b9668e64",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "title = f\"# OSSR statistics on the {date.today()}\"\n",
+    "\n",
+    "ossr_records = get_ossr_records()\n",
+    "stats_names = ['downloads', 'unique_downloads', 'views', 'unique_views', ]\n",
+    "sum_stats = {key: sum([int(rec.data['stats'][key]) for rec in ossr_records]) for key in stats_names}\n",
+    "\n",
+    "text = f\"## There are {len(ossr_records)} records in the OSSR.\\n\"\n",
+    "for key, value in sum_stats.items():\n",
+    "    text+=f\"{key.replace('_', ' ')}: {value}\\n\\n\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2f5effcb",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "fe656e0b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "md(title)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "df351e32",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "md(text)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "d0e84058",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}