scaffold: pbx-svx-deb package repo (placeholder README)

Public prebuilt-.deb repo for pbx_svx. No packages yet — driver in design.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GwKsj51W8xnA2T6YEh9Kpc

README.md

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+# pbx_svx — prebuilt packages
+
+Prebuilt `.deb` packages for **[pbx_svx](https://git.sa7aux.se/bjorne/pbx-svx)**,
+the direct PBX ↔ SVXReflector bridge channel driver (`chan_pbx_svx`) — no
+AllStar in the path.
+
+## Install
+
+```sh
+sudo apt install ./debs/pbx-svx_<version>_<arch>.deb
+```
+
+`<arch>` is `arm64` or `amd64`. Built against the PBX box's Asterisk
+(e.g. FreePBX 17 / Asterisk 20/21).
+
+See the source repo for setup and the design write-up.
+
+> **Status:** placeholder — no packages published yet; the driver is still in
+> design/scaffold.