Divorce rule

My wife is working in a school and have an extra merital relationship with the vice-Principal(Brother) in her school for about 3 years. They used to make conversation through social media like Whatsapp, FB and also through SMS, phone calling, video calling. The incident, I had in my knowledge but due to security, education and social status of my daughter who is 15 years old, I could not do anything else during this period. My wife didn't know that I have known everything else of their relationship. For your kind information that when I came to know my wife's extra merital affairs, in my wife's absent I used to check her mobile phone and make photo of the SMS, Whatsapp in my phone and save it to my pen drive during this time which is not in her knowledge. A huge number of documents(photo) I have collected from her SMS/Whatsapp conversation. As per the SMS/Whatsapp they both used to meet in a secured place after her school is over. Incidentally from 10th May to 16th May I had to go outstation for official assignment. But on 22nd May my daughter have ran away with the driver of her school car leaving behind us. We first made a missing diary to the nearest police station because we were not connecting with my daughter's mobile phone but after 10 p.m. we were able to connect her and came to know that she had left us with her school car driver and will never come back. After that we met the boy's residence to rescue my daughter but she refused to come. With the help of the police we ultimately rescued her and came to know the reason behind leaving us. As per my daughter's version her mother has an extra merital affairs which she knows 1 year earlier through checking her mother’s mobile phone in her absent. When I was out of station she checked her mobile and came to know that her mother have spent one night with the brother of the school in my residence by sending her(my daughter) to my in-laws house. Then she took decision to left us on 22nd May, 2017. Knowing this I charged my wife regarding this but she could not give me the satisfactory reply and I then and there told her to leave me. I then left my house to stay in my elder sister's house. After 2 days on 2nd she informed me that she has come back to her parents house. After that I approached her for mutual divorce but she is not showing any interest. What to do? May I make a case file towards divorce against her on the basis of the electronic documents (SMS, Whatsapp photocopy or saved documents in the pen drive)?