git-daemon: add page

pages/common/git-daemon.md

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+# git daemon
+
+> A really simple server for Git repositories.
+> More information: <https://git-scm.com/docs/git-daemon>.
+
+- Launch a Git daemon with a whitelisted set of directories:
+
+`git daemon --export-all {{path/to/directory1}} {{path/to/directory2}}`
+
+- Launch a Git daemon with a specific base directory and allow pulling from all sub-directories that look like Git repositories:
+
+`git daemon --base-path={{path/to/directory}} --export-all --reuseaddr`
+
+- Launch a Git daemon with a base directory with allowed push access and verbosity:
+
+`git daemon --base-path={{path/to/directory}} --export-all --enable=receive-pack --reuseaddr --informative-errors --verbose`