added support for fseq files

usermods/FSEQ/README.md

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+### Configure PlatformIO
+
+Add the following configuration to your `platformio_override.ini` (or `platformio.ini`) to enable the necessary build flags and define the usermod:
+
+```ini
+[env:esp32dev_V4]
+build_flags = 
+  -D WLED_DEBUG
+  -D WLED_USE_SD_SPI
+  -D USERMOD_FSEQ
+  -std=gnu++17
+  -I wled00/src/dependencies/json
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+# SD & FSEQ Usermod for WLED
+
+This usermod adds support for playing FSEQ files from an SD card and provides a web interface for managing SD files and FSEQ playback. Follow the instructions below to install and use this usermod.
+
+---
+
+## Installation
+
+### 1. Modify `usermods_list.cpp`
+
+Add the following lines to register the FSEQ usermod. Make sure that you **do not** include any conflicting modules (e.g. `usermod_sd_card.h`):
+
+```cpp
+#ifdef USERMOD_FSEQ
+  #include "../usermods/FSEQ/usermod_fseq.h"
+#endif
+
+#ifdef USERMOD_FSEQ
+  UsermodManager::add(new UsermodFseq());
+#endif
+
+// #include "../usermods/sd_card/usermod_sd_card.h"
+
+
+### 2. Configure PlatformIO
+
+Add the following configuration to your platformio_override.ini (or platformio.ini) to enable the necessary build flags and define the usermod:
+
+
+[env:esp32dev_V4]
+build_flags = 
+  -D WLED_DEBUG
+  -D WLED_USE_SD_SPI
+  -D WLED_PIN_SCK=18    ; CLK
+  -D WLED_PIN_MISO=19   ; Data Out (POCI)
+  -D WLED_PIN_MOSI=23   ; Data In (PICO)
+  -D WLED_PIN_SS=5      ; Chip Select (CS)
+  -D USERMOD_FSEQ
+  -std=gnu++17
+
+
+
+### 3. Update the WLED Web Interface
+
+To integrate the new FSEQ functionality into the WLED UI, add a new button in your index.htm file. For example, insert the following button into the navigation area:
+
+<!-- New button for SD & FSEQ Manager -->
+<button onclick="window.location.href=getURL('/sd/ui');">
+  <i class="icons">&#xe0d2;</i>
+  <p class="tab-label">Fseq</p>
+</button>
+
+
+This button will take you to the SD & FSEQ Manager interface.
+
+
+
+###Usage
+	•	Web Interface:
+Access the SD & FSEQ Manager by clicking the Fseq button in the main UI. The interface allows you to view, upload, and delete SD card files as well as control FSEQ playback.
+	•	File Management:
+The SD file manager displays all files on the SD card. You can upload new files via the provided form and delete files using the red “Delete” button. 
+	•	FSEQ Playback:
+Once an FSEQ file is loaded, the usermod will play the sequence on the LED strip. Use the provided web interface to start and stop playback.
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