Let's document! Git edition

For those not in the know, tldr-pages is about more than just commands. Those commands that are too expansive to fit on 1 page often have multiple subcommands - which we can document on their own pages. For example, try these:

tldr git merge
tldr git add
tldr ip address

In the case of git, it has quite a number of subcommands (139 ❗). Let's document them all!

• add (#159)
• am (#2352)
• annotate (#5096)
• apply (#4252)
• archimport - this is for importing projects that use the GNU Arch SCM, which is deprecated in favor of GNU Bazaar...should we still add this page?
• archive (#4362)
• bisect (#1227)
• blame (#366)
• branch (#159)
• bugreport (#5097)
• bundle (#4364)
• cat-file (#4492)
• check-attr (#5098)
• check-ignore (#3113)
• check-mailmap (#5099)
• check-ref-format (#5100)
• checkout (#159)
• checkout-index (#5107)
• cherry (#4473)
• cherry-pick (#1196)
• clean (#1157)
• clone (#159)
• column (#5108)
• commit (#159)
• commit-graph (#5109)
• commit-tree (#5113)
• config (#363)
• count-objects (#5114)
• credential (#5115)
• credential-cache - you're not actually supposed to invoke this one, the synopsis is git config credential.helper 'cache [<options>]', see the docs
• credential-store - same here #9735
• cvsexportcommit #9736
• cvsimport #18814
• cvsserver
• daemon (#5938)
• describe (#4413)
• diff (#159)
• diff-files (#6896)
• diff-index (#11234)
• diff-tree (#11234)
• difftool (#4127)
• fast-export #18490
• fast-import #18819
• fetch (#473)
• fetch-pack
• filter-branch #18865
• fmt-merge-msg
• for-each-ref (#16531)
• for-each-repo (#5490)
• format-patch (#2351)
• fsck (#3954)
• gc (#1741)
• get-tar-commit-id #18751
• gitweb
• grep (#2833)
• gui (#12258)
• hash-object (#9060)
• help (#4019)
• http-backend
• imap-send
• index-pack
• init (#159)
• instaweb (#4017)
• interpret-trailers
• log (#159)
• ls-files (#159)
• ls-remote (#4538)
• ls-tree (#3644)
• mailinfo (#5939)
• mailsplit
• maintenance (#5463)
• merge (#159)
• merge-base(#9382)
• merge-file(#14928)
• merge-index #18864
• merge-one-file #18864
• merge-tree #18865
• mergetool (#3947)
• mktag
• mktree (#11725)
• multi-pack-index
• mv (#364)
• name-rev
• notes (#4042)
• p4 #18864
• pack-objects
• pack-redundant
• pack-refs
• patch-id
• prune (#4696)
• prune-packed
• pull (#368)
• push (#159)
• quiltimport
• range-diff (#5701)
• read-tree
• rebase (#473)
• reflog (#2042)
• remote (#274)
• repack (#4018)
• replace (#4496)
• request-pull (#4241)
• rerere #18865
• reset (#1088)
• restore (#3247)
• rev-list (#3644)
• rev-parse (#3644)
• revert (#3151)
• rm (#365)
• send-email (#4265)
• send-pack
• shortlog (#2044)
• show (#1331)
• show-branch (#4016)
• show-index (#5940)
• show-ref (#4426)
• sparse-checkout #18526
• stash (https://github.com/tldr-pages/tldr/commit/891310fb948c882e30619f80366b9dbe508d9e0b)
• status (#159)
• stripspace (#5094)
• submodule (#837)
• svn (#591)
• switch (#3246)
• symbolic-ref (#6938)
• tag (#367)
• unpack-file(#9168)
• unpack-objects (#23919)
• update-index (#3911)
• update-ref (#4373)
• update-server-info (#22681)
• var (#5095)
• verify-commit (#5946)
• verify-pack (#13214)
• verify-tag (#6139)
• whatchanged (#5935)
• worktree (#1232)
• write-tree (#11584)