Add submodule snippets

snippets/add-submodule.md

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+---
+title: Add a submodule
+tags: repository,submodule,advanced
+---
+
+Adds a new submodule to the repository.
+
+- Use `git submodule add <upstream-path> <local-path>` to add a new submodule from `<upstream-path>` to `<local-path>`.
+
+```sh
+git submodule add <upstream-path> <local-path>
+```
+
+```sh
+git submodule add https://github.com/30-seconds/30-seconds-of-code ./30code
+# Creates the directory `30code` containing the submodule from
+# "https://github.com/30-seconds/30-seconds-of-code"
+```

snippets/clone-missing-submodules.md

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+---
+title: Clone missing submodules
+tags: repository,submodule,advanced
+---
+
+Clones missing submodules and checks out commits.
+
+- Use `git submodule update --init --recursive` to clone missing submodules and checkout commits.
+
+```sh
+git submodule update --init --recursive
+```
+
+```sh
+git submodule update --init --recursive
+# Clones missing submodules and checks out commits
+```

snippets/delete-submodule.md

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+---
+title: Delete a submodule
+tags: repository,submodule,advanced
+---
+
+Deletes a submodule from the repository.
+
+- Use `git submodule deinit -f -- <submodule>` to unregister the specified `<submodule>`.
+- Use `rm -rf .git/modules/<submodule>` to remove the directory of the submodule.
+- Use `git rm -f <submodule>` to remove the working tree of the submodule.
+
+```sh
+git submodule deinit -f -- <submodule>
+rm -rf .git/modules/<submodule>
+git rm -f <submodule>
+```
+
+```sh
+git submodule deinit -f -- 30code
+rm -rf .git/modules/30code
+git rm -f 30code
+# Removes the `30code` submodule
+```

snippets/pull-all-submodules.md

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+---
+title: Pull all submodules from remote
+tags: repository,submodule,advanced
+---
+
+Pulls all submodules from their respective remotes.
+
+- Use `git submodule update --recursive --remote` to pull all submodules from their respective remotes.
+
+```sh
+git submodule update --recursive --remote
+```
+
+```sh
+git submodule update --recursive --remote
+# Pulls all submodules from their respective remotes
+```