README: add initial description of the package

Signed-off-by: Alejandro Mery <amery@jpi.io>

README.md

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+# asciigoat's INI parser
+
+[![Go Reference][godoc-badge]][godoc]
+[![Go Report Card][goreport-badge]][goreport]
+
+`asciigoat.org/ini` is a simple Go library that very loosly parses
+[`INI`-style][wikipedia-dosini] documents allowing the implementation
+of stricter parsers of similar form.
+
+**asciigoat** is [MIT](https://opensource.org/license/mit/) licensed.
+
+[godoc]: https://pkg.go.dev/asciigoat.org/ini
+[godoc-badge]: https://pkg.go.dev/badge/asciigoat.org/ini.svg
+[goreport]: https://goreportcard.com/report/asciigoat.org/ini
+[goreport-badge]: https://goreportcard.com/badge/asciigoat.org/ini
+
+[godoc-lexer]: https://pkg.go.dev/asciigoat.org/core/lexer
+[godoc-parser-parser]: https://pkg.go.dev/asciigoat.org/ini/parser#Parser
+
+[wikipedia-dosini]: https://en.wikipedia.org/wiki/INI_file
+
+## Parser
+
+[`parser.Parser`][godoc-parser-parser] uses
+[`asciigoat`'s lexer][godoc-lexer] to process an `INI`-style document
+emiting tokens and errors via callbacks.
+
+## Other Implementations
+
+* [gcfg](https://pkg.go.dev/gopkg.in/gcfg.v1)
+* [unknwon's go-ini](https://github.com/go-ini/ini)
+* [wlevene's GoINI](https://github.com/wlevene/ini)
+
+## See also
+
+* [asciigoat.org/core](https://asciigoat.org/core)
+* [oss.jpi.io](https://oss.jpi.io)
+* [INI file][wikipedia-dosini] (_wikipedia_)
+* [TOML](https://www.kelche.co/blog/go/toml/)