Git 創建分支並進行分支合併和更新

• Create new branch: git checkout -b branch_name
• Create/link to remote sub-branch : git push --set-upstream origin branch_name
• Swith to sub-branch: git checkout branch_name
• Merge sub-branch code into master:
  git checkout master
  git merge branch_name
• Update master code into sub-branch: git merge master/git update
• Delete sub-branch: git checkout -d branch_name
  delete remote sub-branch, use soctrack