adding hw2 key
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10

downloading HW
Added lab7 on PCA
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
Updated syllabus
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
added hw3