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')

Spelling: committed

Spelling (en-us): behavior

Spelling: forbidden

Brand: Mercurial

Grammar: paragraphs should end with periods

Grammar: the

Grammar: resulting issues

Grammar: introduced

Grammar: has

Spelling: versioning

Spelling: unnecessary