add bal root files

bal/README.md

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+# BalPlugin
+Bitcoin After Life Electrum Plugin
+
+Free and decentralized Bitcoin inheritance support for Electrum: build
+time-locked "will" transactions that transfer your funds to your heirs if you
+stop refreshing them (dead-man's switch), optionally relayed by will-executor
+servers.
+
+## Key behaviours
+
+- **Anticipate / postpone safety**: changing the delivery time of an
+  already-signed will is handled safely. Postponing a signed/sent will first
+  asks you to invalidate the old transaction on-chain (so a will-executor can
+  never broadcast the earlier-locktime transaction and execute the inheritance
+  too early), then lets you rebuild and re-send the new one via
+  **Tools → Prepare**.
+- **"Server" column**: the will transaction list shows whether each transaction
+  is actually stored on the will-executor servers
+  (`Confirmed on server`, `Sent (not checked)`, `Send failed`,
+  `Not on server`, `Signed (not sent)`, `Not sent`), with a tooltip showing the
+  will-executor URL.
+
+See the top-level [`README.md`](../README.md) for installation and testing.