Example .gitignore file

Remove all added files with
git rm --cached 
Then add them to the gitignore file. Example:

# git ignore file
# comments start with hash

# ignore all object files, all
# files ending either with '.o' or '.a'
*.[oa]

# Ignore all files with
# the extension *.swp
*.swp

# Ignore a single file
/folderA/folderB/build.info

# Ignore a folder named
# temporary in the base folder.
/temporary/

# Ignore folders named _object
#  anywhere inside the project.
_object/