Update readme.md

Author: marci1175

readme.md

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 # Silence-core
+Silence. _**Break the silence**_.
 
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-### A crate to make voip services easier to create.
 Silence-core provides core functions, helpers and type definitions for a voip service to work.
 If you just want a quick and easy way to set up a voip service, you should use [silence](https://crates.io/crates/silence) instead as it provides a more complete (end-user friendly) approach.
+This crate provides 2 main functionalities:
+
+* Type definitions:
+This crate provides Type definitions and traits in order to make the handling of packets easier.
+
+* APIs for performing audio I/O:
+The crate provides multiple ways to handle audio I/O on multiple platforms efficiently.
+
+* APIs for receiving image input:
+The crate provides ways to utilize the user's webcam to send images.
+
+* APIs for encoding in certain codecs:
+The crate provides ways to encode the raw auudio samples with [opus](https://opus-codec.org/). It also provides ways to encode raw images with the [AV1](https://en.wikipedia.org/wiki/AV1) codec.
+
+A complete version of the documentation is available at [here](https://docs.rs/silence-core/latest).