add 'users' table  updated the schema
delete unnecessary tests folder
write user model validation specs
add user model with validations
add tests for user model associations
add user association to pitches table
add user association to reactions table
modify user association tests for deprecated syntax
add user factory
modify broken factory
add belongs_to associations for pitch and reaction
modify user model tests to implement user factory
add user model, with validations and testing
Merge branch 'users_model'