Updated Default configuration (markdown)

Default-configuration.md

@@ -33,6 +33,19 @@ The table below shows default values of parameters that are common accross all s
 | RFM96/98        | 434.0 MHz         | 125.0 kHz | 9                | 4/7         | private network | 10 dBm       | 8 symbols       |
 | LR1110/20       | 434.0 MHz         | 125.0 kHz | 9                | 4/7         | private network | 10 dBm       | 8 symbols       |
 
+### FSK packet
+For all FSK modules, RadioLib configures the following settings, if the hardware supports it.
+
+| Preamble | Sync word | Length byte | Payload  | CRC     |
+| -------- | --------- | ----------- | -------- | ------- |
+| 16 bits  | 16 bits   | 8 bits      | N*8 bits | 16 bits |
+
+* Preamble: `0xAAAA`
+* Sync word: `0x12AD`
+* Length byte: length of the payload in bytes
+* CRC: CCITT CRC16 (initial value `0x1D0F`, polynomial `0x1021`, final XOR `0xFFFF`)
+* Encoding: Non-return to zero (no encoding applied)
+
 ## Modules
 
 Legend: