Add codespell configuration file

This file defines Arduino's standardized configuration for the codespell spellchecker tool.

The file will also allow project specific configuration of exclusions to fix false positives.

Author: per1234

.codespellrc

@@ -0,0 +1,9 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check/.codespellrc
+# See: https://github.com/codespell-project/codespell#using-a-config-file
+[codespell]
+# In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here:
+ignore-words-list = ,
+skip = ./.licenses,.git,__pycache__,node_modules,go.mod,go.sum,package-lock.json,poetry.lock,yarn.lock
+builtin = clear,informal,en-GB_to_en-US
+check-filenames =
+check-hidden =