Add example

examples/organisationsnummer.rs

@@ -0,0 +1,25 @@
+use organisationsnummer::{Organisationsnummer, OrganisationsnummerError};
+use std::env;
+
+fn main() -> Result<(), OrganisationsnummerError> {
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 2 {
+        println!("Usage: cargo run --example organisationsnummer <organisationsnummer>");
+        return Err(OrganisationsnummerError::InvalidInput);
+    }
+
+    let org = Organisationsnummer::new(&args[1])?;
+
+    if org.valid() {
+        println!(
+            "The company with organization number {} is a {} and the vat number is {}",
+            org.format().long(),
+            org.r#type(),
+            org.vat_number()
+        );
+    } else {
+        println!("invalid organization number provided");
+    }
+
+    Ok(())
+}