Create sub-com.md
Create sub-com.md

initial commit

Former-commit-id: dc7dd2cd64c23f27d8e917c12b4ecb7ada5dba09 [formerly 8aff2d37272fb50fe0c30f34b197423d696e297a]
Former-commit-id: 522fe4baf56bd58070a5e5f7cbdae9e7e303e9f4
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io