readme: add various missing parts

hgignore: add an ignore rule for test timing Modern tests runner store a record of last test run timing. We properly ignore it.

tests: change quoting pattern to match core's conventions This patch modifies two tests to match new quoting patterns used in core: (use "hg config --edit" to set your username) becomes (use 'hg config --edit' to set your username) and (use hg resolve and hg graft --continue) becomes (use 'hg resolve' and 'hg graft --continue')

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