document project intent

README.md

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+# :B:illBöt
+
+_To :b:reserve and prötec_
+
+This will be a [Matrix](https://matrix.org) bot used to track
+informal debts between some (small) group of individuals.
+
+its goals are (in order of importance):
+1. any party can recalculate their position(s) even when the bot is unreachable.
+2. support 1-to-1 and 1-to-many "transactions".
+3. transactions may be visible to only the direct parties involved.
+4. upgradable without any manual migration.
+5. optional reminders for outstanding debts.
+
+but so far, :B:illBöt achieves exactly 0 of these 🙃