Add a command to clean up outdated git branches

git/README.md

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+# Git Scripts
+
+### Definition
+
+These scripts should be used to demonstrate how combine the power of nushell with git commands.
+
+### Aliases
+If you find some of these scripts useful you can add them as aliases in your git config file.
+
+For instance you can create a nushell script in your computer and define in your git config file an alias that call that script:
+```
+[alias]
+    bcl = !nu \"D:\\Tools\\gitalias_bcl.nu\"
+```

git/git_branchcleanup_.nu

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+# Script that remove outdated local branches from a git repo
+# More information on this article https://www.techwatching.dev/posts/cleaning-git-branches
+
+git branch -vl '*/*' | lines | split column " " BranchName Hash Status --collapse-empty | where Status == '[gone]' | each { git branch -D $it.BranchName }