multi: add README's for all sub-packages

zpay32/README.md

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+zpay32
+=======
+
+[![Build Status](http://img.shields.io/travis/lightningnetwork/lnd.svg)]
+(https://travis-ci.org/lightningnetwork/lnd) 
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)]
+[![GoDoc](https://img.shields.io/badge/godoc-reference-blue.svg)]
+(http://godoc.org/github.com/lightningnetwork/lnd/zpay32)
+
+The zpay32 package implements a basic scheme for the encoding of payment
+requests between two `lnd` nodes within the Lightning Network. The zpay32
+encoding scheme uses the
+[zbase32](https://philzimmermann.com/docs/human-oriented-base-32-encoding.txt)
+scheme along with a checksum to encode a serialized payment request.
+
+The payment request serialized by the package consist of: the destination's
+public key, the payment hash to use for the payment, and the value of payment
+to send.
+
+## Installation and Updating
+
+```bash
+$ go get -u github.com/lightningnetwork/lnd/zpay32
+```