initial work for adding docs

docs/README.md

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+# Luvi documentation
+
+Modules:
+
+- [lminiz](./output/markdown/miniz.md)

docs/gen.lua

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+local fs = require 'fs'
+local join = require 'pathjoin'.pathJoin
+local generators = require './generators'
+
+local function dir(path)
+  if not fs.existsSync(path) then
+    assert(fs.mkdirpSync(path))
+  end
+  return path
+end
+
+-- TODO: a full CLI tool?
+
+local output_dir = dir('./output')
+local input_dir = dir('./modules')
+
+local modules_docs = {}
+for entry, entry_type in fs.scandirSync(input_dir) do
+  if entry_type == 'file' then
+    table.insert(modules_docs, dofile(join(input_dir, entry)))
+  end
+end
+
+for _, docs in ipairs(modules_docs) do
+  for gen_name, generator in pairs(generators) do
+    local content = generator.generate(docs)
+    local dir_path = dir(join(output_dir, gen_name))
+    local file_name = docs.name .. generator.extension
+    assert(fs.writeFileSync(join(dir_path, file_name), content))
+  end
+end

docs/generators/init.lua

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+return {
+  markdown = require './markdown',
+}