Add release workflow and changelog

.github/workflows/release.yaml

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+name: Release
+
+permissions:
+  contents: write
+
+on:
+  push:
+    tags:
+      - v[0-9]+.*
+
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: taiki-e/create-gh-release-action@v1
+        with:
+          # (optional) Path to changelog.
+          changelog: CHANGELOG.md
+          # (required) GitHub token for creating GitHub Releases.
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  upload-assets:
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: taiki-e/upload-rust-binary-action@v1
+        with:
+          # (required) Comma-separated list of binary names (non-extension portion of filename) to build and upload.
+          # Note that glob pattern is not supported yet.
+          bin: xqr
+          # (optional) On which platform to distribute the `.tar.gz` file.
+          # [default value: unix]
+          # [possible values: all, unix, windows, none]
+          tar: unix
+          # (optional) On which platform to distribute the `.zip` file.
+          # [default value: windows]
+          # [possible values: all, unix, windows, none]
+          zip: windows
+          # (required) GitHub token for uploading assets to GitHub Releases.
+          token: ${{ secrets.GITHUB_TOKEN }}

CHANGELOG.md

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+# 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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2022-08-11
+### Added
+- `xqr encode` command
+- `xqr decode` command
+- `xqr generate-key-pair` command