readme update

README.md

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 # hexefx_audiolib_F32
-Audio effects library for Teensy4.x (extension to OpenAudio_ArduinoLibrary)
+Audio effects library for Teensy4.x (extension to OpenAudio_ArduinoLibrary)  
+
+## Effects  
+**AudioEffectInfinitePhaser_F32**  
+Infinite/barberpole phaser (mono version). Creates acoustic illusion of infinite move forwards or backwards.  
+
+**AudioEffectPhaserStereo_F32**  
+Stereo phaser with up to 12 stages.  
+
+**AudioEffectMonoToStereo_F32**  
+Mono to stereo converter.  
+
+**AudioEffectPlateReverb_F32**  
+Stereo plate reverb.  
+
+**AudioFilterToneStackStereo_F32**  
+Stereo guitar tone stack (EQ) emulator.  
+
+## I/O  
+**AudioInputI2S2_F32**  
+**AudioOutputI2S2_F32**  
+Input and output for the I2S2 interface, Teensy 4.1 only.  
+
+## Basic  
+Single header basic building blocks for various DSP components:  
+- allpass filter  
+- lfo  
+- delay line  
+- delay line based pitch shifter  
+- shelving lowpass and hipass filter
+- lowpass filter  
+
+## Example projects  
+https://github.com/hexeguitar/hexefx_audiolib_F32_examples
+
+---  
+Copyright 01.2024 by Piotr Zapart  
+www.hexefx.com
+