Added license and readme

COPYING

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+Copyright © 2019 Brandon Dyck
+
+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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+hatmill - HTML generation DSL for Go
+=====================================
+[![License](https://img.shields.io/badge/license-MIT-green.svg)](https://gitlab.codemonkeysoftware.net/b/hatmill/blob/master/COPYING)
+[![Gitlab pipeline status](https://gitlab.codemonkeysoftware.net/b/hatmill/badges/master/pipeline.svg)](https://gitlab.codemonkeysoftware.net/b/hatmill/commits/master)
+[![Go Report Card](https://goreportcard.com/badge/gitlab.codemonkeysoftware.net/b/hatmill)](https://goreportcard.com/report/gitlab.codemonkeysoftware.net/b/hatmill)
+[![GoDoc](https://godoc.org/gitlab.codemonkeysoftware.net/b/hatmill?status.svg)](https://godoc.org/gitlab.codemonkeysoftware.net/b/hatmill)
+![Badge count](https://img.shields.io/badge/badges-5-yellow.svg)
+
+Installation
+---------------
+There are three necessary packages:
+
+  - `gitlab.codemonkeysoftware.net/b/hatmill`
+  - `gitlab.codemonkeysoftware.net/b/hatmill/attribute`
+  - `gitlab.codemonkeysoftware.net/b/hatmill/element`
+
+Install them as you would any other Go package, with `go get` or whatever.
+`gitlab.codemonkeysoftware.net/b/hatmill` is a Go module and so will play nicely
+with Go ≥ 1.11.
+
+Usage
+------
+Basic types are in `gitlab.codemonkeysoftware.net/b/hatmill`. The `attribute`
+and `element` subpackages contain helper functions for HTML5 attributes and
+elements. See the `Example` function in `hatmill_test.go`.
+
+Hacking
+--------
+If there is a missing attribute or element helper function, describe it in
+`defs.json` and run `go generate` in the repository root. If you can't figure
+out what you need to know by reading `defs.json`, `internal/codegen/*`,
+`attribute/*`, and `element/*`, then
+[pester me](https://gitlab.codemonkeysoftware.net/b/hatmill/issues/new) to
+improve the documentation.