feat: phase accum documentation

docs/PhaseAccumulation.md

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+Certainly! Here's a simple example of phase accumulation in Python code:
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+
+# Parameters
+sample_rate = 44100  # Sample rate in Hz
+frequency = 440  # Frequency of the oscillator in Hz
+duration = 1  # Duration of the generated waveform in seconds
+
+# Calculate the phase increment per sample
+phase_increment = 2 * np.pi * frequency / sample_rate
+
+# Initialize phase and time arrays
+num_samples = int(duration * sample_rate)
+phase = np.zeros(num_samples)
+time = np.arange(num_samples) / sample_rate
+
+# Perform phase accumulation
+for i in range(1, num_samples):
+    phase[i] = phase[i - 1] + phase_increment
+
+# Generate the waveform (sine wave) based on the accumulated phase
+waveform = np.sin(phase)
+
+# Plot the waveform
+plt.plot(time, waveform)
+plt.xlabel('Time (s)')
+plt.ylabel('Amplitude')
+plt.title('Phase Accumulation Example - Sine Wave')
+plt.show()
+```
+
+In this example, we specify the sample rate, frequency, and duration of the waveform. We calculate the phase increment per sample based on the desired frequency. Then, we initialize arrays to store the phase values and time values. By iterating through each sample, we perform phase accumulation by adding the phase increment to the previous phase value.
+
+Finally, we generate a sine wave by taking the sine of the accumulated phase values. The resulting waveform is plotted using Matplotlib.
+
+This code demonstrates the basic concept of phase accumulation, where the phase of an oscillator is incremented over time to generate a periodic waveform. You can modify the parameters, try different waveforms, or experiment with phase modulation to create more complex sounds.