add Chart.js packages

static/js/chartjs-adapter-date-fns/README.md

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+# chartjs-adapter-date-fns
+
+[![release](https://img.shields.io/github/release/chartjs/chartjs-adapter-date-fns.svg?style=flat-square)](https://github.com/chartjs/chartjs-adapter-date-fns/releases/latest) [![travis](https://img.shields.io/travis/chartjs/chartjs-adapter-date-fns.svg?style=flat-square&maxAge=60)](https://travis-ci.org/chartjs/chartjs-adapter-date-fns) [![awesome](https://awesome.re/badge-flat2.svg)](https://github.com/chartjs/awesome)
+
+## Overview
+
+This adapter allows the use of date-fns with Chart.js.
+
+Requires [Chart.js](https://github.com/chartjs/Chart.js/releases) **2.8.0** or later and [date-fns](https://date-fns.org/) **2.0.0** or later.
+
+**Note:** once loaded, this adapter overrides the default date-adapter provided in Chart.js (as a side-effect).
+
+## Installation
+
+### npm
+
+```bash
+npm install date-fns chartjs-adapter-date-fns --save
+```
+
+```javascript
+import { Chart } from 'chart.js';
+import 'chartjs-adapter-date-fns';
+```
+
+### CDN
+
+By default, `https://cdn.jsdelivr.net/npm/chartjs-adapter-date-fns` returns the latest (minified) version, however it's [highly recommended](https://www.jsdelivr.com/features) to always specify a version in order to avoid breaking changes. This can be achieved by appending `@{version}` to the url:
+
+```html
+<script src="https://cdn.jsdelivr.net/npm/chart.js/dist/chart.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/chartjs-adapter-date-fns/dist/chartjs-adapter-date-fns.bundle.min.js"></script>
+```
+
+Read more about jsDeliver versioning on their [website](http://www.jsdelivr.com/).
+
+## Configuration
+
+### Locale support via scale options
+
+date-fns requires a date-fns locale object to be tagged on to each `format()` call, which requires the locale to be explicitly set via the `adapters.date` option: [Chart.js documentation on adapters.date](https://www.chartjs.org/docs/next/axes/cartesian/time#date-adapters)
+
+For example:
+
+```javascript
+// import date-fns locale:
+import {de} from 'date-fns/locale';
+
+
+// scale options:
+{
+    adapters: {
+        date: {
+            locale: de
+        }
+    }
+}
+```
+
+Further, read the [Chart.js documentation](https://www.chartjs.org/docs/next) for other possible date/time related options. For example, the time scale [`time.*` options](https://www.chartjs.org/docs/next/axes/cartesian/time#configuration-options) can be overridden using the [date-fns tokens](https://date-fns.org/docs/format).
+
+## Development
+
+You first need to install node dependencies (requires [Node.js](https://nodejs.org/)):
+
+```bash
+> npm install
+```
+
+The following commands will then be available from the repository root:
+
+```bash
+> npm run build         // build dist files
+> npm run lint          // perform code linting
+```
+
+## License
+
+`chartjs-adapter-date-fns` is available under the [MIT license](LICENSE.md).