update readme with dot15d4 as binary

README.md

@@ -20,6 +20,48 @@ dot15d4 = "0.1.0"
 
 For more information, see the [API documentation](https://docs.rs/dot15d4).
 
+## dot15d4 as a binary
+
+This repository also contains a binary that can be used to parse IEEE 802.15.4 frames.
+
+### Usage
+
+```sh
+dot15d4 40ebcdabffff0100010001000100003f1188061a0e0000000000011c0001c800011b00
+```
+
+Output:
+```txt
+Frame Control
+  frame type: Enhanced Beacon
+  security: 0
+  frame pending: 0
+  ack request: 0
+  pan id compression: 1
+  sequence number suppression: 1
+  information elements present: 1
+  dst addressing mode: Short
+  src addressing mode: Extended
+  frame version: 2 (Ieee802154_2020)
+Addressing
+  dst pan id: abcd
+  dst addr: ff:ff (broadcast)
+  src addr: 00:01:00:01:00:01:00:01
+Information Elements
+  Header Information Elements
+    HeaderTermination1
+  Payload Information Elements
+    MLME
+      TschSynchronization
+        ASN: 14, join metric: 0
+      TschTimeslot
+        slot ID: 0
+      ChannelHopping
+        sequence ID: 0
+      TschSlotframeAndLink
+        #slot frames: 0
+```
+
 ## License
 
 Licensed under either of