[btcsuite/btcd] 1c332b: btcjson: Add README.md and doc.go for btcjsonv2.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 1c332b283f7c9c159cc3503fb470a45116e7ed7c
      
https://github.com/btcsuite/btcd/commit/1c332b283f7c9c159cc3503fb470a45116e7ed7c
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-04-03 (Fri, 03 Apr 2015)

  Changed paths:
    A btcjson/v2/btcjson/README.md
    A btcjson/v2/btcjson/doc.go

  Log Message:
  -----------
  btcjson: Add README.md and doc.go for btcjsonv2.