Add README and issue templates (support + feature request)

README.md

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+# Support & Feature Requests
+
+Help and ideas for the Inference Cooperative — in one place.
+
+This is where members open an issue when they need help, hit a bug, or want to
+propose a feature. We read every issue; an admin (or, soon, a support tool)
+will triage it.
+
+## Before you post
+
+- **Need a quick answer?** Try the [docs](https://git.inference.coop/co-op/docs)
+  first — onboarding, API access, and the model list live there.
+- **It's a governance question** (pricing, priorities, direction)? Take it to the
+  [Loomio forum](https://forum.inference.coop), not here.
+- **Something private?** Don't post account details or API keys in an issue.
+  Email [info@inference.coop](mailto:info@inference.coop) instead.
+
+## How to open an issue
+
+Click **New Issue** and pick the template that fits:
+
+- **Support** — something's broken, or you're stuck and need help.
+- **Feature request** — an idea for a new capability or improvement.
+- **Bug report** — a defect or unexpected behavior (no template for this yet;
+  describe what happened, what you expected, and how to reproduce it).
+
+## What happens next
+
+1. An admin labels and triages the issue.
+2. For bugs/features, we may move the work to the relevant repo (`code/*`) and
+   link back here.
+3. You'll get updates on the issue as we go.
+
+Everything here is public and open to all members — see the
+[Infrastructure](https://git.inference.coop/co-op/docs/src/branch/main/infrastructure.md)
+doc for how the Git and membership tie together.