Add dashboard widget to show the latest notes. Issue #51

p.s: I would like to be able to select a particular tag to show, but
none of the dashboard widgets are configurable.

I hate increasing the app size from 300k to almost 3 mb for something
so simple, but we must adapt to the majority and use vue here.

src/NotesService.js

@@ -0,0 +1,21 @@
+import axios from '@nextcloud/axios'
+import { generateUrl } from '@nextcloud/router'
+import { showError } from '@nextcloud/dialogs'
+
+function url(url) {
+	url = `apps/quicknotes${url}`
+	return generateUrl(url)
+}
+
+export const getDashboardData = () => {
+	return axios
+		.get(url('/notes/dashboard'))
+		.then(response => {
+			return response.data
+		})
+		.catch(err => {
+			console.error(err)
+			showError(t('notes', 'Fetching notes for dashboard has failed.'))
+			throw err
+		})
+}