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Sometimes some files are accedntily added into the source control, which later relaized caused by not include a project level .gitignore

Below command provide way to remove all track files which should be ignored

1. Produce the .gitignore file first and place in the root of git project

2. Remove all files (-r for recurse, . mean from current directory) from git
   but leave the physical file untouch (indicate by the --cache option)

git rm -r --cached .

1. since everything is removed from git but not the physical file, do a add
   will add all local file to stage. This time, take into account of .gitignore rule

git add .

1. commit change - all path in .gitignore will be deleted

git commit -m "Add gitignore and remove ignore track file"