Add the Apache-2.0 licence, NOTICE and contributing guide

README.md

@@ -237,7 +237,7 @@ cd void-packages && ./xbps-src pkg voiced
 ```
 
 `INSTALL` and `REMOVE` must sit next to the template; xbps-src packs them. The source is a tagged archive of the
-private repository (see the comments at the top of the template; `checksum=SKIP` until a tarball is published).
+repository (see the comments at the top of the template; `checksum=SKIP` until a tarball is published).
 xbps-src builds in a network-less chroot, so vendor the dependencies first: run `cargo vendor` in `src-tauri/` (with a
 `.cargo/config.toml` pointing at `vendor/`) and populate the npm cache, and include the results in the source
 archive. The template runs `npm ci` (not `--omit=optional`: that removes
@@ -305,6 +305,12 @@ Settings, Diagnostics.
 - Not implemented (deferred): copies and watermarks, PDF/A, custom margins, user background textures, SVG logo
   import, CESS, composition and SEZ invoices.
 
-## Ownership
+## Licence and credit
 
-© Bongbetic. All rights reserved. This is a private application.
+Voiced is released under the [Apache License 2.0](LICENSE). Copyright 2026 Bongbetic.
+
+You are free to use, modify, fork and redistribute it. If you do, you must keep the `LICENSE` and `NOTICE` files and
+the copyright notices, and state your changes; please also credit the original: **Based on Voiced by Bongbetic**.
+Bundled fonts keep their own SIL Open Font License texts (see "Fonts and licences").
+
+Contributions are welcome, see [CONTRIBUTING.md](CONTRIBUTING.md). Contributions are licensed under the same terms.