Improve the job commit step

Signed-off-by: Oktawian Chojnacki <oktawian@me.com>

Author: ochococo

.github/workflows/generate-playground.yml

@@ -29,6 +29,10 @@ jobs:
  run: |
  git config --local user.email "action@github.com"
  git config --local user.name "GitHub Action"
+ git add Design-Patterns-CN.playground.zip
+ git add Design-Patterns.playground.zip
+ git add README.md
+ git add README-CN.md
  git commit -m "Generate Playground"
  ## Push changes to master branch
  - name: Push changes