Add basic btcd command documentation.

This will be expanded upon in future commits.

doc.go

@@ -0,0 +1,47 @@
+// Copyright (c) 2013 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+btcd is a full-node bitcoin implementation written in Go.
+
+Usage:
+        btcd [OPTIONS]
+
+The flags are:
+  -h, --help           Show this help message
+  -V, --version        Display version information and exit
+  -C, --configfile=    Path to configuration file
+  -b, --datadir=       Directory to store data
+  -a, --addpeer=       Add a peer to connect with at startup
+      --connect=       Connect only to the specified peers at startup
+      --nolisten       Disable listening for incoming connections -- NOTE:
+                       Listening is automatically disabled if the --connect
+                       option is used or if the --proxy option is used without
+                       the --tor option
+  -p, --port=          Listen for connections on this port (default: 8333,
+                       testnet: 18333)
+      --maxpeers=      Max number of inbound and outbound peers
+      --banduration=   How long to ban misbehaving peers.  Valid time units are
+                       {s, m, h}.  Minimum 1 second
+  -u, --rpcuser=       Username for RPC connections
+  -P, --rpcpass=       Password for RPC connections
+  -r, --rpcport=       Listen for JSON/RPC messages on this port
+      --norpc          Disable built-in RPC server -- NOTE: The RPC server is
+                       disabled by default if no rpcuser/rpcpass is specified
+      --nodnsseed      Disable DNS seeding for peers
+      --proxy=         Connect via SOCKS5 proxy (eg. 127.0.0.1:9050)
+      --proxyuser=     Username for proxy server
+      --proxypass=     Password for proxy server
+      --tor            Specifies the proxy server used is a Tor node
+      --testnet        Use the test network
+      --regtest        Use the regression test network
+      --nocheckpoints  Disable built-in checkpoints.  Don't do this unless you
+                       know what you're doing
+      --dbtype=        Database backend to use for the Block Chain
+      --profile=       Enable HTTP profiling on given port -- NOTE port must be
+                       between 1024 and 65536
+  -d, --debuglevel=    Logging level {trace, debug, info, warn, error,
+                       critical}
+*/
+package main