feat: adding lua linter

.luacheckrc

@@ -0,0 +1,49 @@
+std = "luajit"
+
+globals = {
+  "vim",
+  "_",
+}
+
+read_globals = {
+  "describe",
+  "it",
+  "before_each",
+  "after_each",
+  "assert",
+}
+
+max_line_length = false
+
+ignore = {
+  "211", -- unused function
+  "212", -- unused argument
+  "213", -- unused loop variable
+  "311", -- value assigned is unused
+  "312", -- value of argument is unused
+  "314", -- value of field is overwritten before use
+  "411", -- variable redefines
+  "421", -- shadowing local variable
+  "431", -- shadowing upvalue
+  "432", -- shadowing upvalue argument
+  "511", -- unreachable code
+  "542", -- empty if branch
+  "631", -- max_line_length
+}
+
+files["lua/codetyper/adapters/nvim/autocmds.lua"] = {
+  ignore = { "111", "113", "131", "231", "241" }, -- TODO: fix undefined refs and dead stores
+}
+
+files["lua/codetyper/adapters/nvim/ui/context_modal.lua"] = {
+  ignore = { "113" }, -- TODO: fix undefined run_project_inspect
+}
+
+files["lua/codetyper/core/scheduler/loop.lua"] = {
+  ignore = { "241" }, -- mutated but never accessed
+}
+
+exclude_files = {
+  ".luarocks",
+  ".luacache",
+}