Add README

README.md

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+# lndhub.go stats
+
+A collection of [Deno][1] scripts for exporting anonymized statistics from
+[lndhub.go][2] databases.
+
+## Requirements
+
+* [Deno](https://docs.deno.com/runtime/getting_started/installation/) (>= 2.3)
+
+## Configuration
+
+Copy `.env.example` to `.env` and edit the values. Or use system environment
+variables instead.
+
+* `BATCH_SIZE` controls how many parallel connections to your database are established
+* `MAX_INVOICES` will skip users with extreme amounts of transactions (above this threshold)
+
+## Generate anonymization key
+
+Generate a random key so you can use it as `ANONYMIZATION_KEY`:
+
+### Usage
+
+    deno run generate-key.ts
+
+## Generate daily stats per user
+
+This will generate daily statistics per user, exported to `daily-stats.csv`:
+
+* Anonymized user ID
+* Date
+* Balance Start of Day
+* Balance End of Day
+* Balance Max Day
+* Balance Min Day
+* Total Flow Out
+* Total Flow In
+
+### Usage
+
+    deno run -A generate-stats.ts
+
+## Contact
+
+E-Mail, Chat, Social: raucao@kosmos.org
+
+[1]: https://deno.com
+[2]: https://github.com/getAlby/lndhub.go