add btc package

wallets/btc/go.mod

@@ -0,0 +1,20 @@
+module github.com/planetdecred/dcrlibwallet/wallets/btc
+
+require (
+	decred.org/dcrwallet/v2 v2.0.2-0.20220505152146-ece5da349895
+	github.com/asdine/storm v0.0.0-20190216191021-fe89819f6282
+	github.com/btcsuite/btcd v0.22.1
+	github.com/btcsuite/btcd/btcutil v1.1.1
+	github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1
+	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
+	github.com/btcsuite/btcutil v1.0.3-0.20210527170813-e2ba6805a890 // note: hoists btcd's own require of btcutil
+	github.com/btcsuite/btcwallet v0.12.0
+	github.com/btcsuite/btcwallet/walletdb v1.4.0
+	github.com/btcsuite/btcwallet/wtxmgr v1.3.0
+	github.com/decred/slog v1.2.0
+	github.com/jrick/logrotate v1.0.0
+	github.com/lightninglabs/neutrino v0.13.1-0.20211214231330-53b628ce1756
+	github.com/planetdecred/dcrlibwallet v1.7.0 // indirect
+)
+
+go 1.16