update readme

Author: mahula

README.md

@@ -3,4 +3,65 @@ A GitHub Action to build and deploy Vuepress sites to GitHub Pages
 
 This repository has been forked from @jenkey2011's [Vuepress deploy Github Action](https://github.com/jenkey2011/vuepress-deploy) to keep the code current and useful.
 At the moment this is work in progress and not published at the [Github Marketplace](https://github.com/marketplace/) yet.    
-To use the [Vuepress deploy Github Action](https://github.com/marketplace/actions/vuepress-deploy) please refer to its current [README](https://github.com/jenkey2011/vuepress-deploy#).
+
+To further use @jenkey2011's [Vuepress deploy Github Action](https://github.com/marketplace/actions/vuepress-deploy) please refer to its current [README](https://github.com/jenkey2011/vuepress-deploy#).
+
+## Usage
+Create `vuepress-deploy.yml` in the `.github/workflows` directory in the root of your repository.
+
+```yml
+name: Build and Deploy
+on: [push]
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+
+    - name: vuepress-deploy
+      uses: jenkey2011/vuepress-deploy@master
+      env:
+        ACCESS_TOKEN: ${{ secrets.ACCESS_TOKEN }}
+        TARGET_REPO: username/repo
+        TARGET_BRANCH: master
+        BUILD_SCRIPT: yarn && yarn build
+        BUILD_DIR: blog/.vuepress/dist/
+```
+
+The action will auto deploy the vuepress project when you push your code. Enjoy!
+
+## Parameters
+
+|  Parameter |  Description | Type | Required
+| :------------ | :------------ |:------------ |:------------ |
+| `ACCESS_TOKEN` | Personal access token | `secrets`  |  **Yes** |
+| `TARGET_REPO` | The repository you want to deploy. e.g.:`jenkey2011/blog`. Default: **current repository** | `env` | **No** |
+| `TARGET_BRANCH` | The branch you want to deploy. e.g.:`gh-pages`.Default: **gh-pages** | `env` | **No** |
+| `TARGET_LINK` | The full address of the target repo will cover `TARGET_REPO` for other platforms. e.g.:`https://user:${{ secrets.CODING_TOKEN }}@team.coding.net/team/repo.git`. | `env` | **No** |
+| `BUILD_SCRIPT` | The script to build the vuepress project. e.g.: `yarn && yarn build` | `env` | **Yes** |
+| `BUILD_DIR` | The output of the build-script above. e.g.: `blog/.vuepress/dist/` | `env` | **Yes** |
+| `COMMIT_MESSAGE` | The commit message supplied when pushing new changes e.g.: `Auto deploy from Github Actions` | `env` | **No** |
+| `CNAME` | Alias Record of your site. | `env` | **No** |
+
+
+## Step-by-Step Guide
+
+### Create a personal access token
+
+click your profile icon > Settings > Developer settings > Personal access tokens > Generate new token (Classic) > At least check `repo`. Then you will get a token, copy it.
+
+### Creating encrypted secrets
+
+Under your repository name, click  Settings > Secrets > Type `ACCESS_TOKEN` in the "Name" input box && the the personal access token as value.
+
+### Create a workflow file
+If you repo doesn't already have one, create a workflow file. You must store workflows in the `.github/workflows` directory in the root of your repository.
+
+In `.github/workflows`, add a `.yml` or `.yaml` file for your workflow. For example, `.github/workflows/vuepress-deploy.yml`.
+
+**For more information**:
+
+1. [Triggering new workflows using a personal access token](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#triggering-new-workflows-using-a-personal-access-token)
+2. [Encrypted secrets](https://docs.github.com/en/actions/reference/encrypted-secrets)
+3. [Learn GitHub Actions](https://docs.github.com/en/actions/learn-github-actions)