Add LD2410 sensor usermod

usermods/LD2410_v2/readme.md

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+# BH1750 usermod
+
+> This usermod requires a second UART and was only tested on the ESP32
+
+
+This usermod will read from a LD2410 movement/presence sensor.
+
+The movement and presence state are displayed in both the Info section of the web UI, as well as published to the `/movement` and `/stationary` MQTT topics respectively.
+
+## Dependencies
+- Libraries
+  - `ncmreynolds/ld2410@^0.1.3`
+  - This must be added under `lib_deps` in your `platformio.ini` (or `platformio_override.ini`).
+- Data is published over MQTT - make sure you've enabled the MQTT sync interface.
+
+## Compilation
+
+To enable, compile with `USERMOD_LD2410` defined  (e.g. in `platformio_override.ini`)
+```ini
+[env:usermod_USERMOD_LD2410_esp32dev]
+extends = env:esp32dev
+build_flags =
+    ${common.build_flags_esp32}
+    -D USERMOD_LD2410
+lib_deps = 
+    ${esp32.lib_deps}
+    ncmreynolds/ld2410@^0.1.3
+```
+
+### Configuration Options
+The Usermod screen allows you to:
+- enable/disable the usermod
+- Configure the RX/TX pins