Add the initial rough skeleton for a config tool.

internal/configparser/errors.go

@@ -0,0 +1,11 @@
+package configparser
+
+import "fmt"
+
+type EmptyConfigError struct {
+	directory string
+}
+
+func (e *EmptyConfigError) Error() string {
+	return fmt.Sprintf("no config files found at %s", e.directory)
+}