Revert "Delete .gitignore"

This reverts commit f54134980b0088d36dd1d54dfc82808a2b6bb892.
Revert "Revert "Delete .gitignore""

This reverts commit 439ed2f79a7fd49afec26e60e9b2e26e76877de6.
Revert "Revert "Revert "Delete .gitignore"""

This reverts commit e1b088e15c98344ac72577a2c165b896e4644610.