feat: update documentation and configuration files for Neovim setup

Signed-off-by: juliano.barbosa <julianomb@gmail.com>

.luacheckrc

@@ -0,0 +1,51 @@
+-- Global objects
+globals = {
+    "vim",
+    "assert",
+    "after_each",
+    "before_each",
+    "describe",
+    "it",
+    "teardown",
+    "pending",
+}
+
+-- Rerun tests only if their modification time changed
+cache = true
+
+-- Don't report unused self arguments of methods
+self = false
+
+-- Redefine these functions to support OpenResty AWS Lambda
+read_globals = {
+    "ngx",
+    "jit",
+    "require",
+    "package",
+    "string",
+    "table",
+    "math",
+    "io",
+    "os",
+    "print",
+    "tonumber",
+    "tostring",
+    "type",
+    "select",
+    "pairs",
+    "ipairs",
+    "next",
+    "error",
+    "pcall",
+    "xpcall",
+    "unpack",
+}
+
+-- Maximum line length
+max_line_length = 120
+
+-- Don't report unused arguments
+unused_args = false
+
+-- Don't check unreachable code
+unreachable = false