esphome-docs Add documentation for LD2413 mmWave sensor

Description:

This PR adds documentation for the new LD2413 mmWave distance sensor.

The HLK-LD2413 is a compact 24GHz radar sensor designed for high-precision, non-contact measurement of liquid and material levels. The documentation includes:

Overview and product description
Example YAML configuration
Pinout tables (J1 and J2)
Product images

Related issue (if applicable): None

Pull request in esphome with YAML changes (if applicable):

esphome/esphome#8661

Apr 30 '25 18:04 BBart19

Walkthrough

A new documentation file has been introduced for the LD2413 millimeter wave distance sensor within the ESPHome ecosystem. This file details the sensor’s features, provides pinout tables for its connectors, and offers a sample YAML configuration for integration via UART. The documentation also explains required parameters, references standard sensor configuration options, and links to related ESPHome resources.

Changes

File(s)	Change Summary
components/sensor/ld2413.rst	Added new documentation describing the LD2413 sensor, its features, pinouts, and configuration.

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components/sensor/ld2413.rst (1 hunks)

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components/sensor/ld2413.rst

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