docs: personal access token (apptools-lab#810)

* docs: personal access token

* docs: same size

.github/CONTRIBUTING.md

@@ -97,6 +97,27 @@ $ vsce publish -p YOUR_PERSONAL_ACCESS_TOKEN
   https://iceworks.oss-cn-hangzhou.aliyuncs.com/vscode-extensions/beta/Iceworks.zip
 - When your PR has been merged into `master` branch, changed packages and VS Code Extensions will be auto published.
 
+#### Personal Access Token
+
+Get a Personal Access Token:
+
+1. From organization's home page(`https://dev.azure.com/iceworksteam`) open the User settings dropdown menu next to your profile image and select **Personal access tokens**: 
+    ![](https://img.alicdn.com/imgextra/i4/O1CN01g6uKB51MBPZcyaVc7_!!6000000001396-2-tps-746-429.png_790x10000.jpg)
+2. On the Personal Access Tokens page, select New Token to create a new Personal Access Token and set the following details:
+    ![](https://img.alicdn.com/imgextra/i4/O1CN01yKsJ7u27siyDzSHYv_!!6000000007853-2-tps-1216-820.png_790x10000.jpg)
+
+    1. Give it a Name
+    2. Set Organization to All accessible organizations
+    3. Optionally extend its expiration date
+    4. Set Scopes to Custom defined and choose the Marketplace > Manage scope
+    5. Select Create and you'll be presented with your newly created Personal Access Token. Copy it.
+
+Set Personal Access Token for Github Actions: 
+
+1. Visit [Actions secrets](https://github.com/ice-lab/iceworks/settings/secrets/actions)
+2. Update `VSCE_TOKEN`:
+    ![](https://img.alicdn.com/imgextra/i2/O1CN01NpeNCf2558rTm9812_!!6000000007474-2-tps-2880-1754.png_790x10000.jpg)
+
 ## Pull Request Guidelines
 
 - Only code that's ready for release should be committed to the master branch. All development should be done in dedicated branches.