done with groups hierarchy with its 3 levels validations scenario and code only #235
modified create a new parent group conditions #235
done with documentation #235
pulled master and merged with master #235
modified button views #235
pulled master to make pull request and modified validations messages #235
Merge pull request #312 from yousraHazem/c2_sama_groups_three_levels_hierarchy

C2 sama groups three levels hierarchy
removed merging conflicts #273