From Ahmed Ali’s “Twilight in Delhi” to William Dalrymple’s “City of Djinns”, many books have tried to unravel the layers of Delhi’s history. First-time fiction writer Nilanjana Roy took a less-trodden path in her novel “The Wildings,” which came out in August in India — and which might come out in the United States as soon as next year. She wrote of life in the alleys of Delhi, but chose to do it from the perspective of cats in her novel.