Added luarocks build

LICENCE

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+MIT License
+​
+Copyright (c) 2020 Shishkov Dmitriy
+​
+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.

md-offliner-1.0-1.rockspec

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+package = "md-offliner"
+version = "1.0-1"
+source = {
+   url = "git://github.com/Dm1tr1y147/md_offliner",
+   tag = "v1.0",
+}
+description = {
+   summary = "Markdown article online assets downloader.",
+   detailed = [[
+      This tool helps to download all images in markdown document and put them into one folder with changed paths.
+   ]],
+   license = "MIT/X11"
+}
+dependencies = {
+   "lua >= 5.1, <= 5.4",
+   "luasocket >= 2.0.2-6",
+   "luasec >= 0.9-1",
+}
+build = {
+   type = "builtin",
+   modules = {
+      main = "src/main.lua",
+      ["src.arg_proc"] = "src/arg_proc.lua",
+      ["src.netw_ops"] = "src/netw_ops.lua",
+      ["src.process_md"] = "src/process_md.lua",
+      ["lib.argparse"] = "lib/argparse.lua"
+   },
+   copy_directories = { "spec" }
+}