docs: update README.md

Author: ansidev

README.md

@@ -1,11 +1,35 @@
 # sample-gitflow-release-workflows
 
-Sample Gitflow release workflow using GitHub Actions.
+[![Release](https://img.shields.io/github/release/ansidev/sample-gitflow-release-workflows.svg)](https://github.com/ansidev/sample-gitflow-release-workflows/releases)
+[![Build Status](https://github.com/ansidev/sample-gitflow-release-workflows/workflows/release/badge.svg)](https://github.com/ansidev/sample-gitflow-release-workflows/actions)
+
+Sample Gitflow release workflow using GitHub Actions and official [GitHub CLI](https://cli.github.com/manual/).
+
+## Features
+
+- Auto create and publish a new release on merging changes from `release/**`/`hotfix/**` into `main`.
+- Auto create corresponding git tag with the released version.
+- Auto create PR and merge changes from `release/**`/`hotfix/**` back into `develop`.
 
 ## Manual
 
-- Workflow definitions: [release.yaml](./.github/workflows/release.yaml)
-- You have to update two env variables: `BRANCH_MAIN`, `BRANCH_DEVELOP` if necessary.
+- Workflows
+
+  | Name    | Description        | File                                             |
+  | ------- | ------------------ | ------------------------------------------------ |
+  | Release | Automate releasing | [release.yaml](./.github/workflows/release.yaml) |
+
+- You have to update below env variables if necessary
+
+  | Environment variable | Description            | Default value |
+  | -------------------- | ---------------------- | ------------- |
+  | BRANCH_MAIN          | The main branch        | `main`        |
+  | BRANCH_DEVELOP       | The develop branch     | `develop`     |
+  | TAG_PREFIX           | The prefix for git tag | `v`           |
+
+## Contact
+
+Le Minh Tri [@ansidev](https://ansidev.xyz/about).
 
 ## License