add luacheck and workflow / switch to mod.conf / add readme.md

.github/workflows/luacheck.yml

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+name: luacheck
+on: [push, pull_request]
+jobs:
+  luacheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+      - name: Luacheck
+        uses: lunarmodules/luacheck@master

.luacheckrc

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+globals = {
+	"slats"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+	table = {fields = {"copy", "getn"}},
+
+	-- Minetest
+	"vector", "ItemStack",
+	"dump", "minetest",
+	"VoxelManip", "VoxelArea",
+
+	-- mods
+	"default"
+}

mod.conf

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+name = slats
+description = Adds decorative slats that have a lot of uses
+depends = default

readme.md

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+
+slats
+
+![](https://github.com/mt-mods/slats/workflows/luacheck/badge.svg)
+[![License](https://img.shields.io/badge/License-MIT%20and%20CC%20BY--SA%203.0-green.svg)](license.txt)
+[![Download](https://img.shields.io/badge/Download-ContentDB-blue.svg)](https://content.minetest.net/packages/mt-mods/slats)
+
+
+# Overview
+
+Adds decorative slats that have a lot of uses
+
+![](./screenshot.png)
+
+# License
+
+* Code: `MIT`
+* Textures: `CC BY-SA 3.0`