feat(config): add base implementation

* feat(config): naive implementation

feat(config): get command for a run from config

* docs: add config

* fix typo [skip ci]

* test: add config

lua/gopher/config.lua

@@ -0,0 +1,19 @@
+local M = {
+  config = {
+    ---set custom commands for tools
+    commands = {
+      go = "go",
+      gomodifytags = "gomodifytags",
+      gotests = "gotests",
+      impl = "impl",
+    },
+  },
+}
+
+---Plugin setup function
+---@param opts table user options
+function M.setup(opts)
+  M.config = vim.tbl_deep_extend("force", M.config, opts)
+end
+
+return M