[llvm] [docs] Add documentation for LLVM Qualification Group (PR #145331)

[Kristof Beyls via llvm-commits]

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+========================
+LLVM Qualification Group
+========================
+
+Introduction
+============
+
+The LLVM Qualification Group is an open working group within the LLVM community. 
+It was created to coordinate efforts around enabling the use of LLVM components 
+in safety-critical applications such as those governed by ISO 26262 (automotive), 
+DO-178C (aerospace), and EN 50128 (railways).
+
+Motivation
+==========
+
+LLVM is increasingly used in safety-critical domains (e.g., automotive, aerospace, medical),
+but currently lacks a shared structure to address the specific needs of functional safety, 
+such as systematic assurance arguments, tool qualification artifacts, and their associated 
+documentation.
+
+An more open, upstream, reusable, and collaborative approach would benefit the wider ecosystem.
+This group serves as a public forum for those interested in improving LLVM’s suitability for
+use in such environments.
+
+Goals
+=====
+
+The Qualification Group aims to:
+
+* Facilitate open discussion around tool confidence and qualification practices
+* Identify areas for upstream improvements (e.g., traceability hooks, quality evidence)
+* Share safety-relevant documentation and argumentation templates
+* Coordinate efforts across users and vendors working toward similar goals
+* Act as a point of contact for safety-related collaboration
+
+The group is non-enforcing and does not control any part of the codebase.
+All technical decisions remain subject to the standard LLVM review and governance process.
+
+Participation
+=============
+
+Participation is open to anyone interested. The group currently coordinates via:
+
+* LLVM Discourse: https://discourse.llvm.org/
----------------
kbeyls wrote:

Not sure if it would be overly helpful to also indicate which discourse category posts are expected to be in. I see that the on current Discourse post/thread uses "community"

https://github.com/llvm/llvm-project/pull/145331