[feature]Zhihao: add db operation for "job" collection.
1. Add test. test will revert the file and db change after test finished.
2. Implement is done. It will add name (it's from the form you posted),
the time(new Data()), the path (full path) into the "job" collection.
3. I don't know how to use specific db file path to run `mongod /path`
in vargunt. It just works in my local.