add lab-p6 and p6

lab-p6/README.md

lab-p6/airbnb.csv

lab-p6/images/README.md

lab-p6/images/add_group_member.png

lab-p6/images/autograder_success.png

lab-p6/images/gradescope.png

lab-p6/practice.ipynb

lab-p6/practice_test.py

p6/.ipynb_checkpoints/p6-checkpoint.ipynb

p6/README.md

p6/airbnb.csv

p6/images/README.md

p6/images/add_group_member.png

p6/images/autograder_success.png

p6/images/gradescope.png

p6/p6.ipynb

p6/p6_test.py

p6/rubric.md