Add tutorial steps

Author: bzaczynski

python-guitar-synthesizer/source_code_step_1/README.md

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+[tool.poetry]
+name = "digitar"
+version = "0.1.0"
+description = ""
+authors = ["Bartosz Zaczyński <[email protected]>"]
+readme = "README.md"
+packages = [{include = "digitar", from = "src"}]
+
+[tool.poetry.dependencies]
+python = "^3.12"
+numpy = "^1.26.4"
+pedalboard = "^0.9.6"
+pydantic = "^2.7.3"
+pyyaml = "^6.0.1"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"

python-guitar-synthesizer/source_code_step_1/poetry.lock

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+from dataclasses import dataclass
+from decimal import Decimal
+from fractions import Fraction
+from typing import Self
+
+type Numeric = int | float | Decimal | Fraction
+type Hertz = int | float
+
+
+@dataclass(frozen=True)
+class Time:
+    seconds: Decimal
+
+    @classmethod
+    def from_milliseconds(cls, milliseconds: Numeric) -> Self:
+        return cls(Decimal(str(float(milliseconds))) / 1000)
+
+    def __init__(self, seconds: Numeric) -> None:
+        match seconds:
+            case int() | float():
+                object.__setattr__(self, "seconds", Decimal(str(seconds)))
+            case Decimal():
+                object.__setattr__(self, "seconds", seconds)
+            case Fraction():
+                object.__setattr__(
+                    self, "seconds", Decimal(str(float(seconds)))
+                )
+            case _:
+                raise TypeError(f"unsupported type '{type(seconds).__name__}'")
+
+    def get_num_samples(self, sampling_rate: Hertz) -> int:
+        return round(self.seconds * round(sampling_rate))

python-guitar-synthesizer/source_code_step_1/pyproject.toml

@@ -0,0 +1,19 @@
+[tool.poetry]
+name = "digitar"
+version = "0.1.0"
+description = ""
+authors = ["Bartosz Zaczyński <[email protected]>"]
+readme = "README.md"
+packages = [{include = "digitar", from = "src"}]
+
+[tool.poetry.dependencies]
+python = "^3.12"
+numpy = "^1.26.4"
+pedalboard = "^0.9.6"
+pydantic = "^2.7.3"
+pyyaml = "^6.0.1"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"