feat: first commit

Author: Thomas Timmer

README.md

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+# dayjs-plugin-strftime
+
+Adding strftime to day js.
+
+It is just a dayjs wrapper around [strftime](https://github.com/samsonjs/strftime). Go there about customization
+
+## examples
+
+```js
+const dayjs = require("dayjs");
+const strftime = require("dayjs-plugin-strftime");
+
+dayjs.extend(strftime);
+
+// this can be any dayjs object
+let now = dayjs();
+
+// 2021-06-07 12:01:45
+now.strftime("%F %T");
+```
+
+localization is done by:
+
+```js
+const dayjs = require("dayjs");
+const strftime = require("dayjs-plugin-strftime");
+
+dayjs.extend(strftime);
+
+let now = dayjs();
+
+// 25 januari, 2019 00:00:00
+now.strftime("%d %B, %Y %H:%M:%S", "nl_NL");
+```

__tests__/index.js

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+const dayjs = require('dayjs');
+const strftime = require('../index.js');
+
+dayjs.extend(strftime);
+
+test('works', () => {
+    expect(dayjs('2019-01-25').strftime("%B %d, %Y %H:%M:%S")).toBe("January 25, 2019 00:00:00");
+})
+
+test('works localization', () => {
+  expect(dayjs('2019-01-25').strftime("%d %B, %Y %H:%M:%S", "nl_NL")).toBe("25 januari, 2019 00:00:00");
+})

index.js

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+const strftime = require('strftime');
+
+const strftimePlugin = (option, dayjsClass, dayjsFactory) => {
+    dayjsClass.prototype.strftime = function(args, local) {
+        let modifiedFormatter;
+        if (local) {
+            modifiedFormatter = strftime.localizeByIdentifier(local)
+        } else {
+            modifiedFormatter = strftime
+        };
+
+        return modifiedFormatter(args, this.toDate())
+    }
+  }
+
+module.exports = strftimePlugin;