docs: Mention upstream development guide in contributor guidelines Change-Id: Idba1e01dd53c959b272fe0432981914241bf280d Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/177459 Reviewed-by: Kayce Basques <kayce@google.com> Reviewed-by: Anthony DiGirolamo <tonymd@google.com> Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> Pigweed-Auto-Submit: Kayce Basques <kayce@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Pigweed is an open source collection of embedded-targeted libraries–or as we like to call them, modules. These modules are building blocks and infrastructure that enable faster and more reliable development on small-footprint MMU-less 32-bit microcontrollers like the STMicroelectronics STM32L452 or the Nordic nRF52832.
For more information please see our website: https://pigweed.dev/.