Update readme

README.md

@@ -5,6 +5,7 @@
 This repository is a fork of [Egzumer firmare](https://github.com/egzumer/uv-k5-firmware-custom) plus my changes:
 
 * `ENABLE_SPECTRUM_CHANNEL_SCAN` this enables spectrum channel scan mode (enter by going into memory mode and press F+5, this allows SUPER fast channel scanning (**4.5x faster than regular scanning**), regular scan of 200 memory channels takes roughly 18 seconds, **spectrum memory scan takes roughly 4 seconds**, if you have less channels stored i.e 50 - the spectrum memory scan will take only **1 second**
+* `ENABLE_ENCRYPTION` - ChaCha20 256 bit encryption for the messenger, more info at [Encryption](https://github.com/kamilsss655/uv-k5-firmware-custom/wiki/44-%E2%80%90-Encryption#details)
 * Fixed AM AGC so **AM demodulation is crystal clear**, no audible clicks, no need for `AM_FIX`.
 * `RxOff` menu setting offsets the receive frequency by any specified amount in the range of `0-150Mhz` for use with upconverters. Allows to fine tune frequency (in `1kHz` steps) as opposed to other implementations that use hardcoded offsets. (**IMPORTANT: Make sure you set this value to 0 if not using an upconverter, when used for the first time. Otherwise it might load some random offset from EEPROM.**)
 * `ENABLE_SPECTRUM_COPY_VFO` allowing to exit the spectrum and fine tuning screen with PTT button and copy current peak frequency, modulation, step, bandwidth to VFO. Also entering spectrum will carry these settings from VFO (full integration). Now to enter fine tuning screen in spectrum press MENU button. This allows you to save and respond to the frequencies found much faster.
@@ -155,6 +156,7 @@ ENABLE_SPECTRUM_SHOW_CHANNEL_NAME  := 1       shows channel number and channel n
 ENABLE_ULTRA_LOW_POWER_TX          := 0       transmits with ultra low power. useful for dev/testing
 ENABLE_ADJUSTABLE_RX_GAIN_SETTINGS := 1       keeps the rx gain settings set in spectrum mode after exit (otherwise these are always overwritten to default value), this makes much more sense considering that we have a radio with user adjustable gain so why not use it to adjust to current radio conditions, maximum gain allows to greatly increase reception in scan memory channels mode (in this configuration default gain settings are only set at boot and when exiting AM modulation mode to set it to sane value after am fix)
 ENABLE_SPECTRUM_CHANNEL_SCAN       := 1       this enables spectrum channel scan mode (enter by going into memory mode and press F+5, this allows SUPER fast channel scanning (4.5x faster than regular scanning), regular scan of 200 memory channels takes roughly 18 seconds, spectrum memory scan takes roughly 4 seconds, if you have less channels stored i.e 50 - the spectrum memory scan will take only **1 second**
+ENABLE_ENCRYPTION                  := 1       enable ChaCha20 256 bit encryption for messenger
 ```