Add initial project structure and functionality for LED matrix display

- Created .gitignore to exclude build and configuration files.
- Added .vscode/extensions.json for recommended extensions.
- Introduced README files in include and lib directories to explain usage of header files and libraries.
- Configured platformio.ini for ESP32 development environment.
- Implemented credentials.h for WiFi configuration.
- Developed text_display.cpp and text_display.h for displaying text on the LED matrix.
- Created matrix_rain.cpp and matrix_rain.h for rain effect simulation on the matrix.
- Added font3x5_digits.h and font5x7.h for character representation.
- Implemented main.cpp to initialize the matrix and handle WiFi connections.
- Developed time_utils.cpp and time_utils.h for time formatting functions.
- Created wifi_manager.cpp and wifi_manager.h for managing WiFi connections and NTP synchronization.
- Added README in test directory for PlatformIO Test Runner and project tests.

.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch