Isregistration required for software development n deploying

We are a partnership firm with 3 partners developing software, apps and installing the same at the client place (which could be in any part of India) having registered office in Karnataka.Our turnover is less than 20 lakhs.Currently we are not registered under service tax nor vat.

1.Are we required to register under GST?

2.If yes ,what would be the gst rate applicable to us?