Accidently deleted Boot partition
Usually the main macOS partition (disk0s2) is followed by a Recovery HD which is required as second boot stage for particular macOS partitions.

The recovery partition has a standard size of 1269536 512-blocks (or 158692 4096-blocks on 4k disks) and the partition type 426F6F74-0000-11AA-AA11-00306543ECAC. If your attempt to resize/delete macOS partitions from inside Windows (BTW that's a big

) 

didn't screw the partition map somehow or erase/overwrite former blocks of the Recovery HD it should be recoverable by simply adding its probable partition map entry.


Boot to Internet Recovery Mode
Open in the menubar > Utilities > Terminal
get some details:

diskutil list #below I assume the disk identifier of the internal disk is disk0
gpt -r show disk0

Unmount disk0:

diskutil umountDisk disk0

add the recovery partition:

gpt add -i 4 -b 54478096 -s 1269536 -t 426F6F74-0000-11AA-AA11-00306543ECAC disk0

verify disk and recovery partition:

diskutil list #get the disk identifier of the "new" 650.0 MB partition
diskutil verifyDisk disk0       
diskutil verifyVolume disk0sX #use the disk identifier of the "new" 650.0 MB partition (probably disk0s3 or disk0s4)



If you get:


  The volume Recovery HD appears to be OK
  Finished file system verification on disk0sX Recovery HD


from the last command everything is OK and your Mac should boot properly.

Otherwise you have to restore the Recovery HD from scratch or copy it from a Mac with the same system version.