add template

Author: alrocar

TEMPLATE.md

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+# SaaS metrics template
+
+All your SaaS data and metrics in one place.
+
+## Set up the data project
+
+Fork the GitHub repository and deploy the data project to Tinybird.
+
+## Set up the dashboard
+
+Deploy the dashboard to Vercel or use the hosted dashboard at https://tinynest.tinybird.co/ using the Workspace admin [token](https://app.tinybird.co/tokens).
+
+Configure webhooks for the services you want to ingest. See instructions in the [README](https://github.com/tinybirdco/tinynest/blob/main/README.md).