Update README.md

Add pull request and issue templates

Add LICENSE

Add CONTRIBUTING.md

Add CODE_OF_CONDUCT.md

Add big refactor in back and front assets

Change setup order instructions on README.md

Change README.md to add Docker info and new instructions

Change schema.rb

Change database.yml.example to use postgresql instead of mysql2

Add Dockerfile and docker-compose.yml

Change Gemfile to modify some versions and add pg instead of mysql2

Update ruby version to 2.4.0 on .tool-versions

Add JS code to manage sidebar state

Fix create_admin_service adding user name on create