📝 Add docs for first steps

Author: tiangolo

docs/src/first_steps/tutorial001.py

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+import typer
+
+
+def main():
+    typer.echo("Hello World")
+
+
+if __name__ == "__main__":
+    typer.run(main)

docs/src/first_steps/tutorial002.py

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+import typer
+
+
+def main(name: str):
+    typer.echo(f"Hello {name}")
+
+
+if __name__ == "__main__":
+    typer.run(main)

docs/src/first_steps/tutorial003.py

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+import typer
+
+
+def main(name: str, lastname: str):
+    typer.echo(f"Hello {name} {lastname}")
+
+
+if __name__ == "__main__":
+    typer.run(main)

docs/src/first_steps/tutorial004.py

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+import typer
+
+
+def main(name: str, lastname: str, formal: bool = False):
+    if formal:
+        typer.echo(f"Good day Ms. {name} {lastname}.")
+    else:
+        typer.echo(f"Hello {name} {lastname}")
+
+
+if __name__ == "__main__":
+    typer.run(main)

docs/src/first_steps/tutorial005.py

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+import typer
+
+
+def main(name: str, lastname: str = "", formal: bool = False):
+    if formal:
+        typer.echo(f"Good day Ms. {name} {lastname}.")
+    else:
+        typer.echo(f"Hello {name} {lastname}")
+
+
+if __name__ == "__main__":
+    typer.run(main)