git-annotate: add page (#5096)

pages/common/git-annotate.md

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+# git annotate
+
+> Show commit hash and last author on each line of a file.
+> See `git blame`, which is preferred over `git annotate`.
+> `git annotate` is provided for those familiar with other version control systems.
+> More information: <https://git-scm.com/docs/git-annotate>.
+
+- Print a file with the author name and commit hash prepended to each line:
+
+`git annotate {{path/to/file}}`
+
+- Print a file with the author email and commit hash prepended to each line:
+
+`git annotate -e {{path/to/file}}`