Begin module src/free_api_v25/current/

- Add doc comments
- Add sub-module `coord`
- `clippy` fixes

src/free_api_v25/current/coord.rs

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+use serde::{Deserialize, Serialize};
+
+/// Geographic coordinates (longitude and latitude)
+///
+/// # Example
+/// ```
+/// use owm_api25::current::Coord;
+///
+/// let coord = Coord { lon: -0.1257, lat: 51.5085 };
+/// assert_eq!(coord.lon, -0.1257);
+/// assert_eq!(coord.lat, 51.5085);
+/// ```
+#[derive(Debug, Clone, Deserialize, Serialize, Default, PartialEq)]
+pub struct Coord {
+    pub lon: f64,
+    pub lat: f64,
+}
+
+impl Coord {
+    /// Creates new coordinates from longitude and latitude
+    ///
+    /// # Example
+    /// ```
+    /// use owm_api25::current::Coord;
+    ///
+    /// let london = Coord::new(-0.1257, 51.5085);
+    /// ```
+    #[must_use]
+    pub fn new(lon: f64, lat: f64) -> Self {
+        Self { lon, lat }
+    }
+}

src/free_api_v25/current/mod.rs

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+//! # Current Weather Data
+//!
+//! Data structures and utilities for parsing and working with responses
+//! from the **`OpenWeatherMap` Current Weather API**.
+//!
+//! See: <https://openweathermap.org/current>
+//!
+//! ## Features
+//!
+//! - Complete type-safe representation of all API response fields
+//! - Optional fields for resilience against API changes
+//! - Convenient accessor methods
+//! - Chrono integration for date/time handling
+//! - Comprehensive error handling
+//!
+//! ## See Also
+//! - [`forecast`](crate::forecast) for multi-day weather data
+//! - [`query`](crate::query) for building request URLs
+
+pub mod coord;

src/free_api_v25/forecast/mod.rs

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+

src/free_api_v25/query/mod.rs

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+