Add README.

README.md

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+btcws
+=====
+
+[![Build Status](https://travis-ci.org/conformal/btcws.png?branch=master)]
+(https://travis-ci.org/conformal/btcws)
+
+Package btcws implements extensions to the standard bitcoind JSON-RPC
+API for the btcd suite of programs (btcd, btcwallet, and btcgui).
+Importing this package registers all implemented custom requests with
+btcjson (using btcjson.RegisterCustomCmd).
+
+## Sample Use
+```Go
+// Client Side
+import (
+	"code.google.com/p/go.net/websocket"
+	"github.com/conformal/btcws"
+)
+
+// Create rescan command.
+id := 0
+addrs := map[string]struct{}{
+	"17XhEvq9Nahdj7Xe1nv6oRe1tEmaHUuynH": struct{},
+}
+cmd, err := btcws.NewRescanCmd(id, 270000, addrs)
+
+// Set up a handler for a reply with id 0.
+AddReplyHandler(id, func(reply map[string]interface{}) {
+	// Deal with reply.
+})
+
+// JSON marshal and send rescan request to websocket connection.
+websocket.JSON.Send(btcdWSConn, cmd)
+
+
+// Server Side
+import (
+	"code.google.com/p/go.net/websocket"
+	"github.com/conformal/btcjson"
+	"github.com/conformal/btcws"
+)
+
+// Get marshaled request.
+var b []byte
+err := websocket.Message.Receive(clientWSConn, &b)
+
+// Parse marshaled command.
+cmd, err := btcjson.ParseMarshaledCmd(b)
+
+// If this is a rescan command, handle and reply.
+rcmd, ok := cmd.(*btcws.RescanCmd)
+if ok {
+	// Do stuff
+	var reply []byte
+	err := websocket.Message.Send(clientWSConn, reply)
+}
+
+```
+
+## Installation
+
+```bash
+$ go get github.com/conformal/btcws
+```
+
+## GPG Verification Key
+
+All official release tags are signed by Conformal so users can ensure the code
+has not been tampered with and is coming from Conformal.  To verify the
+signature perform the following:
+
+- Download the public key from the Conformal website at
+  https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
+
+- Import the public key into your GPG keyring:
+  ```bash
+  gpg --import GIT-GPG-KEY-conformal.txt
+  ```
+
+- Verify the release tag with the following command where `TAG_NAME` is a
+  placeholder for the specific tag:
+  ```bash
+  git tag -v TAG_NAME
+  ```
+
+## License
+
+Package btcws is licensed under the liberal ISC License.