Issue #2749901 by MaskyS, kleog, priya.chat, harsha012, rakesh.gectcr, shobhit_juyal, snehi, SenthilMohith, neerajpandey, gawaksh, thompsizzle, ecrown, mohit1604, andrewmacpherson, surbz, rahulrasgon, riddhi.addweb: Add README.txt to Bartik theme

Issue #2862671 by masipila, Jo Fitzgerald, kleog, phenaproxima, quietone: Add documentation to SqlBase source plugin