docs(google-sheets): add trigger for new spreadsheets

packages/docs/pages/apps/google-sheets/triggers.md

@@ -0,0 +1,12 @@
+---
+favicon: /favicons/google-sheets.svg
+items:
+  - name: New Spreadsheets
+    desc: Triggers when you create a new spreadsheet
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />