chore: add basic example (#8)

examples/basic.rs

@@ -0,0 +1,12 @@
+fn main() -> Result<(), archspec::cpu::UnsupportedMicroarchitecture> {
+    let architecture = archspec::cpu::host()?;
+
+    println!("Current CPU architecture:");
+    println!("- Name: {}", architecture.name());
+    println!("- Vendor: {}", architecture.vendor());
+    println!("- Generation: {}", architecture.generation());
+    println!("- Family Name: {}", architecture.family().name());
+    println!("- Features: {:?}", architecture.all_features());
+
+    Ok(())
+}