Added Auto Release workflow

.github/workflows/release.yml

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+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+name: Release
+
+jobs:
+  build:
+    name: Create Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          body: |
+            Automatic Release by GitHub Workflow
+          draft: false
+          prerelease: false

CHANGELOG.md

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+# Changelog
+
+# v0.1
+Initial dummy version.

README.md

@@ -1,6 +1,7 @@
 # Doubak
 
 [![GitHub Action CI](https://github.com/its-my-data/doubak/workflows/CI/badge.svg?branch=master)](https://github.com/its-my-data/doubak/actions?query=workflow%3ACI)
+[![GitHub Action CI](https://github.com/its-my-data/doubak/workflows/Release/badge.svg?branch=master)](https://github.com/its-my-data/doubak/actions?query=workflow%3ARelease)
 
 豆瓣 (Douban.com) 备份工具命令行版，备份完整页面镜像，Golang实现。