Add readme, license, and docs

LICENSE

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+Copyright (c) 2019 Jack Christensen
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+[![](https://godoc.org/github.com/jackc/pgproto3?status.svg)](https://godoc.org/github.com/jackc/pgproto3)
+[![Build Status](https://travis-ci.org/jackc/pgproto3.svg)](https://travis-ci.org/jackc/pgproto3)
+
+# pgproto3
+
+Package pgproto3 is a encoder and decoder of the PostgreSQL wire protocol version 3.
+
+Extracted from original implementation in https://github.com/jackc/pgx.

doc.go

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+// Package pgproto3 is a encoder and decoder of the PostgreSQL wire protocol version 3.
+package pgproto3