(zilch lang ninja): document

Change-Id: I6a6a6964dcc713504ec57f40981a601696a573af

docs/modules/ROOT/pages/ninja/man.adoc

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+= zilch-cli-ninja(1)
+Puck Meerburg
+v0.0.1
+:doctype: manpage
+:manmanual: ZILCH-CLI-NINJA
+:mansource: ZILCH
+:page-pagination: prev
+
+== Name
+
+zilch-cli-ninja - builds a Nixpkgs package using Ninja, using Zilch
+
+== Synopsis
+
+*zilch-cli-ninja* [_OPTION_]... _COMMAND_ [_ARG_]...
+
+== Description
+
+This command uses Zilch to build a Ninja-based project entirely within
+Nix, using content-addressed derivations.
+
+This program requires the derivation to build has a configuration file
+written. See the documentation at https://puck.moe/zilch/docs/.
+
+== Subcommands
+*build* [_TARGET_]...::
+  Build the derivation described by the configuration file, or the
+  target nammes from its Ninja file, if any are passed as arguments.
+
+*source* [_DIR_]::
+  Write the source of the derivation to _DIR_, or to `src` if no
+  directory is provided.
+
+*diff*::
+  Compare the 'canonical' source of the derivation to that in the
+  source directory (`src`, or the path selected by `--source`.)
+
+== Options
+
+*-h*::
+*--help*::
+  Print a help message.
+
+*-s* _DIR_::
+*--source* _DIR_::
+  Override the input source for builds. Doesn't reconfigure the build,
+  so changes to the build system do not apply.
+
+*-f* _PATH_::
+*--config-file* _PATH_::
+  The location of the configuration file. Defaults to `zilch.scm`.
+
+*-j* _COUNT_::
+*--max-jobs* _COUNT_::
+  The maximum amount of builds to run. Defaults to the amount of cores.
+
+*-v*::
+*--verbose*::
+  Increase the verbosity configured in the Nix daemon.
+
+*-L*::
+*--print-build-logs*::
+  Print derivation logs as they come in.