Update cheatsheets

tldr/jj-git-init

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jj git init
+
+> Create a new Git backed Jujutsu repo.
+> Note: Unless `--colocate` is used, it is not a valid Git repository and `git` commands can't be used on it.
+> More information: <https://jj-vcs.github.io/jj/latest/cli-reference/#jj-git-init>.
+
+- Create a new Git backed repo in the current directory:
+
+`jj git init`
+
+- Create a new Git backed repo in the given directory:
+
+`jj git init {{path/to/directory}}`
+
+- Initialize the Jujutsu repository as a valid Git repository (allowing the use of both `jj` and `git` commands in the same directory):
+
+`jj git init --colocate`
+
+- Initialize the Jujutsu repository backed by an existing Git repository:
+
+`jj git init --git-repo {{git_repo}}`