✨ Add first version of subcommands tutorial

docs/src/subcommands/tutorial001/app/items.py

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+import typer
+
+app = typer.Typer()
+
+
+@app.command()
+def create(item: str):
+    typer.echo(f"Creating item: {item}")
+
+
+@app.command()
+def delete(item: str):
+    typer.echo(f"Deleting item: {item}")
+
+
+@app.command()
+def sell(item: str):
+    typer.echo(f"Selling item: {item}")
+
+
+if __name__ == "__main__":
+    app()

docs/src/subcommands/tutorial001/app/main.py

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+import typer
+
+from . import items, users
+
+app = typer.Typer()
+app.add_typer(users.app, name="users")
+app.add_typer(items.app, name="items")
+
+if __name__ == "__main__":
+    app()

docs/src/subcommands/tutorial001/app/users.py

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+import typer
+
+app = typer.Typer()
+
+
+@app.command()
+def create(user_name: str):
+    typer.echo(f"Creating user: {user_name}")
+
+
+@app.command()
+def delete(user_name: str):
+    typer.echo(f"Deleting user: {user_name}")
+
+
+if __name__ == "__main__":
+    app()