feat: add customization support through config module

lua/hyper/config.lua

@@ -0,0 +1,32 @@
+local M = {}
+
+local ok, error = pcall(require, 'hyper.error')
+if not ok then
+    return vim.api.nvim_err_writeln(require('hyper.const.error').import)
+end
+
+---@type Config
+local defaults = {
+    colors = 'hyper',
+    highlights = 'hyper',
+
+    color_overrides = {},
+    highlights_overrides = {},
+}
+
+---@type Config
+M.options = {}
+
+---@param options Config|nil
+function M.setup(options)
+    M.options = vim.tbl_deep_extend("force", {}, defaults, options or {})
+end
+
+---@param options Config|nil
+function M.extend(options)
+    M.options = vim.tbl_deep_extend("force", {}, M.options or defaults, options or {})
+end
+
+M.setup()
+
+return M