Improve the README introduction

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

README.md

@@ -6,7 +6,19 @@
 
 ## Introduction
 
-Channel implementations for Python
+Frequenz Channels is a *channels* implementation for Python.
+
+According to [Wikipedia](https://en.wikipedia.org/wiki/Channel_(programming)):
+
+> A channel is a model for interprocess communication and synchronization via
+> message passing. A message may be sent over a channel, and another process or
+> thread is able to receive messages sent over a channel it has a reference to,
+> as a stream. Different implementations of channels may be buffered or not,
+> and either synchronous or asynchronous.
+
+Frequenz Channels are mostly designed after [Go
+channels](https://tour.golang.org/concurrency/2) but it also borrows ideas from
+[Rust channels](https://doc.rust-lang.org/book/ch16-02-message-passing.html).
 
 ## Contributing