aadded styles to button Follow/unfollow

aded system tests using Capybara gem

added test to CommentMailer

added background execution using Sidekiq driver and Redis db

added email notification on new comment to post to user

covered by tests requests comments, likes

added request tests relationships

added request tests for user, post models

added factory bot for models and test for like on uniquness in scope

added and configured rspec sholuda matches factory_bot and cover models tests

fixed routing in nav_menu

added feed option

added Relationship model and options to follow/unfollow user

added comments model and option to create comment to post by using partial

added like model and functionality to like/dislike posts

created post, user models also add base methods and views

Запрос на слияние 'homework_lecture_10' (#12) из homework_lecture_10 в master

added unhappy path for requests tests

covered by tests controllers student and lab_report

added tests with rspec factory-bot shoulda-matchers

fixed some errors remarks from last merge_ request, added links to handle user sessions

added unhappy path for requests tests

covered by tests controllers student and lab_report

added tests with rspec factory-bot shoulda-matchers