Prepare first public release

At this stage, the repo contains:

* a functional Markdown -> Gemini converter
* a program md2gmn that provides an interface to the converter for
  testing purposes

.gitignore

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+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# store test data here
+test

README.md

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+# Hugo-to-Gemini converter
+
+This repo holds a converter of Hugo Markdown posts to
+[text/gemini][Gemtext] (also named Gemtext in this README). The
+converter is supposed to make people using [Hugo](https://gohugo.io)'s
+entrance to [Project Gemini][Gemini], the alternate web, somewhat
+simpler.
+
+[Gemini]: https://gemini.circumlunar.space
+[Gemtext]: https://gemini.circumlunar.space/docs/specification.html
+
+At this stage of development this repo contains the actual renderer
+(`internal/gemini`) and the `md2gmn` program that converts Markdown
+input to Gemtext and is supposed to facilitate testing.
+
+The renderer is somewhat hasty, and is NOT supposed to be able to
+convert the entirety of possible Markdown to Gemtext (as it's not
+possible to do so, considering Gemtext is a lot simpler than Markdown),
+but instead a selected subset of it, enough for conveying your mind in
+Markdown.
+
+The renderer uses the [gomarkdown][gomarkdown] library for parsing
+Markdown.
+
+[gomarkdown]: https://github.com/gomarkdown/markdown
+
+## md2gmn
+
+This program reads Markdown input from either text file (if `-f
+filename` is given), or stdin. The resulting Gemtext goes to stdout.
+
+```
+Usage of md2gmn:
+  -f string
+        input file
+```
+
+## TODO
+
++ [x] convert Markdown text to Gemtext
++ [ ] prepend contents of YAML front matter to Gemtext data
++ [ ] render all Hugo content files to Gemtext in accordance with front
+  matter data and Hugo config
+
+## License
+
+This program is redistributed under the terms and conditions of the GNU
+General Public License, more specifically under version 3 of the
+License. For details, see [COPYING](COPYING).

cmd/gmnhg/main.go

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+// gmnhg converts Hugo posts to gemini content.
+//
+// TODO: it is yet to actually do that.
+package main
+
+func main() {
+	println("in development")
+}

cmd/md2gmn/main.go

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+// This file is part of gmnhg.
+
+// gmnhg is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// gmnhg is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with gmnhg. If not, see <https://www.gnu.org/licenses/>.
+
+// md2gmn converts Markdown text files to text/gemini.
+package main
+
+import (
+	"flag"
+	"io/ioutil"
+	"os"
+
+	gemini "git.tdem.in/tdemin/gmnhg"
+)
+
+func main() {
+	var (
+		input string
+		file  *os.File
+	)
+	flag.StringVar(&input, "f", "", "input file")
+	flag.Parse()
+
+	if input != "" {
+		var err error
+		file, err = os.Open(input)
+		if err != nil {
+			panic(err)
+		}
+	} else {
+		file = os.Stdin
+	}
+	text, err := ioutil.ReadAll(file)
+	if err != nil {
+		panic(err)
+	}
+
+	os.Stdout.Write(gemini.RenderMarkdown(text))
+}