feat ✨: Added .gitignore, README files, partitions, build options, dependencies, and configuration for ESP32-S3 development board using Arduino.

- Added `.gitignore` file to exclude unnecessary build and system files.
- Summary: Added a README file for project headers, improving organization and management of header files in the source codebase.
- Added a README file in the lib directory for project-specific libraries.
- Added new partitions to `partitions.csv`.
- The `git diff` output updates the `platformio.ini` file to include new build and upload options, dependencies, and configuration for an ESP32-S3 development board using Arduino.
- The user has added a new `main.cpp` file, added I2S and FFT functionality to it, and defined a function to calculate the frequency and convert it to a MIDI note number.
- Added a new README file in the `test` directory for PlatformIO Unit Testing.

.gitignore

@@ -0,0 +1,34 @@
+# PlatformIO build files
+.pio/
+.pioenvs/
+.piolibdeps/
+
+# VS Code settings
+.vscode/
+
+# PlatformIO package cache
+.platformio/
+
+# Python virtual environment
+venv/
+env/
+
+# macOS system files
+.DS_Store
+
+# Windows system files
+Thumbs.db
+
+# Compiled object files
+*.o
+*.obj
+
+# Compiled Dynamic libraries
+*.dll
+*.so
+*.dylib
+
+# Firmware binaries
+*.bin
+*.elf
+*.hex