Adding automatic IP address, some refactor and better texts. Upgrading version.

src/ip_api.rs

@@ -0,0 +1,5 @@
+pub fn extract_coords_and_city(ip: &str) -> Result<serde_json::Value, ureq::Error> {
+    let url = format!("http://ip-api.com/json/{}?fields=16592", ip);
+    let body: serde_json::Value = ureq::get(&url).call()?.into_json()?;
+    Ok(body)
+}