Add document of date pipes

docs/en/UI/Angular/DateTime-Format-Pipe.md

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+# DateTime Format Pipes
+
+You can format date by Date pipe of angular.
+
+Example
+
+```html
+<span> {{today | date 'dd/mm/yy'}}</span>
+```
+
+ShortDate, ShortTime and ShortDateTime format data like angular's data pipe but easier. Also the pipes get format from config service by culture.
+
+# ShortDate Pipe
+
+```html
+<span> {{today | shortDatePipe }}</span>
+```
+
+# ShortTime Pipe
+
+```html
+<span> {{today | shortTimePipe }}</span>
+```
+
+# ShortDateTime Pipe
+
+```html
+<span> {{today | shortDateTimePipe }}</span>
+```