adding doc about sqlite init. maybe in future want to do this automatically
adding doc about sqlite init. maybe in future want to do this automatically

shencebebetterme/arxiv-sanity-preserver,shencebebetterme/arxiv-sanity-preserver,karpathy/arxiv-sanity-preserver,shencebebetterme/arxiv-sanity-preserver,zhiyue/arxiv-sanity-preserver,karpathy/arxiv-sanity-preserver,karpathy/arxiv-sanity-preserver,shencebebetterme/arxiv-sanity-preserver,zhiyue/arxiv-sanity-preserver,zhiyue/arxiv-sanity-preserver