added docstrings to ImageSet
added docstrings to ImageSet

madan96/sympy,skidzo/sympy,aktech/sympy,yashsharan/sympy,drufat/sympy,rahuldan/sympy,sampadsaha5/sympy,jaimahajan1997/sympy,kaushik94/sympy,postvakje/sympy,yashsharan/sympy,souravsingh/sympy,sampadsaha5/sympy,chaffra/sympy,aktech/sympy,rahuldan/sympy,madan96/sympy,postvakje/sympy,aktech/sympy,kaushik94/sympy,chaffra/sympy,souravsingh/sympy,madan96/sympy,drufat/sympy,rahuldan/sympy,yashsharan/sympy,skidzo/sympy,sampadsaha5/sympy,jaimahajan1997/sympy,kaushik94/sympy,souravsingh/sympy,chaffra/sympy,jaimahajan1997/sympy,drufat/sympy,postvakje/sympy,skidzo/sympy