chore: add CHANGELOG.md and GitHub release workflow

- Add CHANGELOG.md following Keep a Changelog format, documenting v0.1.0 initial release
- Add .github/workflows/release.yml for manual release process:
  - Reads version from package.json
  - Runs full CI checks (test + lint + format)
  - Packages VS Code extension as .vsix via vsce
  - Creates GitHub Release with .vsix artifact attached

Author: euxx

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+name: Release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  release:
+    name: Package and Release
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Read version from package.json
+        id: version
+        run: echo "version=$(node -p "require('./package.json').version")" >> $GITHUB_OUTPUT
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run checks
+        run: npm run ci
+
+      - name: Package extension
+        run: npx @vscode/vsce package --no-dependencies -o github-copilot-usage-${{ steps.version.outputs.version }}.vsix
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: v${{ steps.version.outputs.version }}
+          name: v${{ steps.version.outputs.version }}
+          generate_release_notes: true
+          files: github-copilot-usage-${{ steps.version.outputs.version }}.vsix

CHANGELOG.md

@@ -0,0 +1,14 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [0.1.0] - 2026-03-10
+
+- 📊 Show GitHub Copilot Premium requests usage in the VS Code status bar
+- 🔄 Auto-refresh with configurable interval (default: 5 minutes)
+- 🟡 Warning threshold indicator (default: 75%)
+- 🔴 Critical threshold indicator (default: 90%)
+- 🔐 GitHub OAuth authentication via VS Code built-in auth provider
+- ⚡ Manual refresh command: "Copilot Usage: Refresh Now"