Added example for E2SM codec test

Initially we were simply parsing E2SM specificiation, Now also added
codec example.

examples/tests/18-e2sm.rs

@@ -5,5 +5,18 @@ mod e2sm {
 }
 
 fn main() {
+    use asn1_codecs::{aper::AperCodec, PerCodecData};
     eprintln!("E2SM");
+
+    // This will break: Fixed
+    let decode_str = "080000000100000000002043514901200000";
+
+    // This one works if it is uncommented
+    //let decode_str = "08000000010000000000204351490120000000";
+
+    let decode_hex = hex::decode(decode_str).unwrap();
+    let mut codec_data = PerCodecData::from_slice_aper(&decode_hex);
+    let e2sm_kpmv3_pdu = e2sm::E2SM_KPM_IndicationMessage::aper_decode(&mut codec_data);
+
+    eprintln!("e2sm_kpmv3_pdu: {:#?}", e2sm_kpmv3_pdu.unwrap());
 }