Create Data Dictionary

[RealDyllon]

Description

Create wiki

Tag everyone here

Everyone: pls feedback

Also create tables in DynamoDB. (part of #4)

[yankai14]

https://entuedu-my.sharepoint.com/:x:/g/personal/c200176_e_ntu_edu_sg/Eeyl0NxpL1NFimT_9mAmPAcBWUtcp4iJgwEMTUMDaIGWRw?e=kI8jgQ

@RealDyllon @cyiafn @ashwin2201 @tayalaks2001