Update the project and event models

[gouravdas3102]

• Updation of project model

• Add domain field

• Add document field -many to many to document model

• Add is_team field -boolean field

• Add project_lead - foreign key with member

• Add contributors - many to many field with member model
  -Add project_status-choices field with a default value

• Updation of event model

• Add domain field- foreign key with domain

• add event_lead -foreign key with member

• add organiser-many to many with member

• Also create and update the existing views for the same with required access as discussed for domain model