Add GitHub Pages workflow and README instructions

Author: wei-nextlab

.github/workflows/gh-pages.yml

@@ -0,0 +1,34 @@
+name: Build and deploy Jekyll site to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+      - master
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.1'
+
+      - name: Install Bundler and dependencies
+        run: |
+          gem install bundler
+          bundle config set --local path vendor/bundle
+          bundle install --jobs 4 --retry 3
+
+      - name: Build site with Jekyll
+        run: bundle exec jekyll build --destination _site
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_site

README.md

@@ -1,2 +1,20 @@
 # ParallelProgammingLabs
 FPGA SoC Verilog HLS 
+
+## Publishing the site (GitHub Pages)
+
+This repository uses Jekyll with the `just-the-docs` theme. A GitHub Actions workflow is included to build the site and publish it to the `gh-pages` branch automatically when `main` or `master` is pushed.
+
+- To preview locally:
+
+```bash
+gem install bundler
+bundle install
+bundle exec jekyll serve
+```
+
+- The workflow file is at `.github/workflows/gh-pages.yml` and will build the site and publish the generated `_site` directory to the `gh-pages` branch using the built-in `GITHUB_TOKEN`.
+
+- After pushing, enable GitHub Pages in the repository settings (if needed) to serve the `gh-pages` branch.
+
+If you'd like, I can also create a `CNAME` file or configure a custom domain for Pages.