add missing file

Author: emizzle

codex/utils/exceptions.nim

@@ -0,0 +1,7 @@
+import std/strformat
+
+proc msgDetail*(e: ref CatchableError): string =
+  var msg = e.msg
+  if e.parent != nil:
+    msg = fmt"{msg} Inner exception: {e.parent.msg}"
+  return msg