Almost half-a-dozen first-time venture capital investors have made their debut since the beginning of this year, indicating growing investor interest in India’s start-ups. Some such investors include Montane Ventures, an early-stage venture capital firm that counts Ajay Piramal’s family office as its lead investor; 021 Capital, founded by Sailesh Tulshan, the personal investment adviser to the Flipkart’s Bansals; Fundamentum, a…