DVC: add page including sub-commands checkout, init, add

pages/common/dvc-add.md

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+# dvc add
+
+> Adds changed files to the index.
+> More information: <https://dvc.org/doc/command-reference/add>.
+
+- Add a single target file to the index:
+
+`dvc add {{path/to/file}}`
+
+- Add target directory to the index:
+
+`dvc add {{path/to/directory}}`
+
+- Recursively add all files in target directory:
+
+`dvc add --recursive {{path/to/directory}}`
+
+- Add target file with custom .dvc file name
+
+`dvc add --file custom_name.dvc {{path/to/file}}`

pages/common/dvc-checkout.md

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+# dvc checkout
+
+> Update data files and directories in the workspace based on current DVC-files.
+> More information: <https://dvc.org/doc/command-reference/checkout>.
+
+- Checkout to latest version, for all target files and directories:
+
+`dvc checkout`
+
+- Checkout to latest version, for a given target:
+
+`dvc checkout {{target}}`
+
+- Checkout specific version of target from different Git commit/tag/branch:
+
+`git checkout {{commit_hash/tag/branch}} {{target}} && dvc checkout {{target}}`

pages/common/dvc-init.md

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+# dvc init
+
+> Initializes a new local DVC repository.
+> More information: <https://dvc.org/doc/command-reference/init>.
+
+- Initialize a new local repository:
+
+`dvc init`
+
+- Initialize DVC without Git:
+
+`dvc init --no-scm`
+
+- Initializing DVC in a subdirectory:
+
+`cd {{path/to/subdir}} && dvc init --sudir`

pages/common/dvc.md

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+# dvc
+
+> Data Version Control i.e git for data
+> More information: <https://dvc.org/>.
+
+- Check the DVC version:
+
+`dvc --version`
+
+- Call general help:
+
+`dvc --help`
+
+- Call help on a command:
+
+`dvc {{command}} --help`
+
+- Execute Git command:
+
+`git {{command}}`