Update README.md

Update README.md

add files for readme.md

page name updated to Barista Test Coverage

Test coverage listing page added

creating separate test coverage for each run

function test case proper error messaging

removed comments from test case execution

removed comments from test data generator

assign random value commented

import fix for set_record_name_child_table

refactored test data generator fro unique and duplicate entry exceptions

test case execution refactored unique and duplicate entry exceptions

assign_random_value fix

moved assign random value code to function