Initial layout: README, changelog and Gitea release upload script

Binaries only, no source. Windows .exe/.msi go up as release attachments
(they are 64-77 MB each, too big for git history); .deb packages are
committed under debs/ like the other *-deb repos.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -0,0 +1,20 @@
+# Changelog
+
+All released builds of darthvader. Versions are `<version>-<git hash>`; the
+hash is the source commit the binaries were built from and is what the app
+shows in its title bar, About dialog and in the version string it reports to
+DMR masters.
+
+## 0.1.0 — unreleased
+
+First packaged build.
+
+* Modes: M17, DMR (BrandMeister / TGIF / any Pi-Star style master), YSF, NXDN,
+  D-STAR, P25, EchoLink, AllStar (IAX), SvxLink, APRS and POCSAG/DAPNET.
+* Hardware: DV3000 / ThumbDV / DVstick AMBE+2 sticks (auto-probed), remote
+  AMBEserver over UDP, and the MD380 software vocoder.
+* Audio chain per direction: preamp → 7-band EQ → LADSPA → AGC → limiter,
+  per mode / peer / server.
+* Windows: `.exe` and `.msi` installers, 15 bundled LADSPA plugins
+  (compressors, gate, limiter, filters, de-esser, EQ, saturation) so chains
+  configured on Linux work unchanged.