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.

platformio.ini

@@ -0,0 +1,36 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-s3-devkitm-1]
+platform = espressif32
+board = esp32-s3-devkitm-1
+framework = arduino     ;, espidf
+
+board_build.arduino.memory_type = qio_qspi
+board_build.flash_mode = qio
+board_build.psram_type = qio
+board_upload.flash_size = 4MB
+board_upload.maximum_size = 4194304
+board_build.partitions = partitions.csv  # Use custom partition table
+build_flags = -DARDUINO_USB_CDC_ON_BOOT=1
+              -DBOARD_HAS_PSRAM
+              -DARDUINO_ESP32S3_DEV
+              -DBOARD_HAS_TEMP_SENSOR
+            ;   -DCONFIG_FREERTOS_HZ=1000
+            ;   -DESP_PLATFORM
+            ;   -DARDUINO_RUNNING
+board_build.filesystem = spiffs
+monitor_speed = 115200
+upload_speed = 921600
+monitor_filters = esp32_exception_decoder
+lib_deps = 
+    https://github.com/pschatzmann/arduino-audio-tools.git
+    https://github.com/pschatzmann/arduino-audio-driver.git
+