add PlatformIO configuration file for ESP32 development with custom build targets

platformio.ini

@@ -0,0 +1,57 @@
+; 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:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+monitor_speed = 115200
+
+lib_deps =
+    tzapu/WiFiManager @ ^2.0.17
+    me-no-dev/ESP Async WebServer @ ^1.2.4
+    me-no-dev/AsyncTCP @ ^1.1.1
+    bogde/HX711 @ ^0.7.5
+    adafruit/Adafruit SSD1306 @ ^2.5.13
+    adafruit/Adafruit GFX Library @ ^1.11.11
+    adafruit/Adafruit PN532 @ ^1.3.3
+    bblanchon/ArduinoJson @ ^7.3.0
+    knolleary/PubSubClient @ ^2.8
+    digitaldragon/SSLClient @ ^1.3.2
+    
+; Enable SPIFFS upload
+board_build.partitions = partitions.csv
+board_build.filesystem = spiffs
+board_upload.flash_size = 4MB
+board_build.spiffs_create = yes
+board_build.spiffs.partition = 2M
+board_build.spiffs.upload_size = 2M
+
+build_flags = 
+    -Os
+    -ffunction-sections
+    -fdata-sections
+    -DNDEBUG
+    -mtext-section-literals
+
+extra_scripts = 
+    pre:gzip_files.py
+    pre:extra_script.py
+    post:$PROJECT_DIR/create_combined_binary.py
+
+# Add custom target for combining binaries
+custom_targets = 
+    combine_binaries
+
+# Define the build sequence
+targets = 
+    buildfs     # Build SPIFFS image
+    buildprog   # Build firmware
+    combine_binaries  # Combine both binaries