git-worktree.md: add page (#1232)

pages/common/git-worktree.md

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+# git worktree
+
+> Manage multiple working trees attached to the same repository.
+
+- Create a new folder with the specified branch checked out into it:
+
+`git worktree add {{path/to/folder}} {{branch}}`
+
+- Create a new folder with a new branch checked out into it:
+
+`git worktree add {{path/to/folder}} -b {{new_branch}}`
+
+- List all the working directories attached to this repository:
+
+`git worktree list`
+
+- Remove a worktree (after deleting worktree folder):
+
+`git worktree prune`