How easy / tough it is to be a working mother in Munich ,

Well, it basivcally boils down to what kind of lifestyle you want. Germany is VERY different in this respect than India. The decision is yours to make and nobody can help you much with it.
Some ideas that come to my mind: You will not have a nanny or other household help in Germany, but public facilities for child care are available and good. And you'll have a much better work-life-balance with max. 40 hour workweeks and 30 days annual leave.

Regarding salary, your husband should definitely compare whether it is competitive in Germany (and do some negotiations if not). But you CANNOT compare Indian and German salaries, since the cost, tax, social security and every other structure is completely different.

It is possible (although it might be difficult) to be a full-time-working couple with two kids in Germany (we are one, too!). But nobody can tell you how easy it is for you to find a job. You should definitely concentrate on settling down and learning German in the first year or so, as it is very difficult to find a job without it.

If you go for public facilities (which are all in German, of course), school is free and day care cheap (subsidized). For international options budget EUR500-1500/month per kid.

Thanks a lot for your inputs , much appreciated, how I am planning to be working there post kids settlement period  , and I got know that STEM resources are in demand , me and my husband also started learning A1 level after which we will do A2 and B1 . My worry is will I easily get place in child care and school for my kids , what are the working hours there ?  do you suggest Public  school VS international schools for overall growth for kids ?

Schooling is compulsory and you are assured a place in the public school nearest to your residence.
Full day child care, however, is in short supply and many centres have waiting lists. So you are well advised to register your child as early as possible (before arrival!) with all centres in reach from your residence and hope to get a place within a few months.

I always recommend public schools, as they give your kids the best chances to learn German, find friends in the neighbourhood and develop a sense of home.
Coming from a foreign school system and without language skills, they might lose a year (during which they'd attend special preparatory classes, which many schools offer for newcomers). I personally don't think this is a problem, and younger kids (below 10 years) usually adjust much faster than that and attend normal classes after just a few months.

how feasible to afford a car there , how much is the monthly car expense ,and how much is the car insurance cost