opensource: Add opensource.md

opensource.md

@@ -0,0 +1,49 @@
+# OpenSource Guidelines
+
+## Summary
+
+This document describes some considerations regarding OpenSource activities.
+Since opensource is about cooperation, there is two different perspectives to cover.
+
+The first one is about *consuming opensource software*
+: when external code is integrated to SiliconLabs projects.
+
+The second part is about *producing opensource software*
+: when SiliconLabs code is shared to users.
+
+In both cases legal, community and architecture aspects should be carrefuly studied.
+
+## Consuming Opensource Software
+
+### Legal
+
+Please refer to internal OSS policy for approved licenses.
+
+### Community
+
+When integrating an external component, beside the legal duties,
+a feedback look is also appreciated:
+issues and fixes are welcome to be communicated upstream (at the source).
+
+For security or sustainability purposes,
+it is also important to follow activities in the upstream project,
+and keep sync with latest stables release or security fixes.
+
+### Architecture
+
+Dependencies should be well tracked (at least location and version should be well identified).
+If the upstream code had to be patched (for integration purposes),
+it should be very clear tracked.
+
+## Producing OpenSource Software
+
+### Legal
+
+Please refer to internal OSS policy for approved licenses.
+
+Each project should provide a license (this is a legal document describing rights and duties).
+
+### Community
+
+### Architecture
+