chore: Setup luacheck config file for project

.luacheckrc

@@ -0,0 +1,21 @@
+unused_args     = false
+redefined       = false
+max_line_length = false
+
+include_files = {
+  "**/*.lua",
+  "*.rockspec",
+  ".luacheckrc",
+}
+
+exclude_files = {
+  -- Tests are too messy to lint
+    "tests",
+  -- Travis Lua environment
+    "here/*.lua",
+  "here/**/*.lua",
+  -- GH Actions Lua Environment
+    ".lua",
+  ".luarocks",
+  ".install",
+}