fillGroupForm method modified

Values changed to parameters in fillGorupForm method.
New class GroupData added

New class GroupData added to project.
Parameter Objec added to fillGroupForm method

Parameters grouped to one object in filGroupForm method.
Test annotation was changed to TestNG annotation

Test annotation was changed to TestNG annotation.
"test-output" folder was added to .gitignore file

"test-output" folder was added to .gitignore file
TestBase class added to project

TestBase class added to project
TestNG annotation changed to Test

TestNG annotation changed to Test for runnig several classes in one
browser.
GroupCreationTests class divided into 2 classes.

GroupCreationTests class divided into 2 classes. AlsoGroupCreationTests
class created with one method from first class.